Potential Purchase of the Week: Select Cars from the Milton Robson Collection

In roughly 25 years, Milton Robson built one of the most lust-worthy muscle car collections in the world. His collection is going up for sale this weekend in Gainesville, Georgia through RM Auctions. There were simply too many to choose from in this great collection, so we chose a few of our favorites for Potential Purchase of the Week.

1957 Chevrolet Factory Airbox Fuel Injected Corvette

1957 was the first year for the fuel injected Corvette, or Fuelies as they're known to collectors and enthusiasts. While fuel injection was a milestone reached that year, it's not what makes this Corvette so special. The factory ram air, or Airbox as it's called, is what distinguishes this Corvette from the rest.

In 1957, a total of only 43 fuel injected Airbox Corvettes were built as it was a particularly expensive option ($726 on a $3200 car). This meant that only serious racers purchased these cars as they wanted the performance gains of the Ramjet fuel injection system. Unfortunately for collectors, historians, and enthusiasts today, this same crowd who bought the cars originally also means that less than half of the original 43 built exist today.

1960 Chrysler 300F Four-Speed Convertible

Chrysler's 300 "letter cars" were introduced in 1955 based on Virgil Exner's idea cars. The letter cars continued through to 1965, but some of the most desirable of the 11-year production run are the 1960 300F models.

Not only is this one of the most desirable of all Chrysler's letter cars, but this is also the only one of this type in existence. Letter cars were typically equipped with Chrysler's three-speed, push-button, Torqueflite automatic transmission, but this car however, was outfitted with a four-speed manual transmission like the seven Special coupes produced.

This "Special" convertible came about when George Kuehn, a wealthy industrialist from Milwaukee, Wisconsin, contacted Chrysler about building a Special-based convertible. He met with company executives and finally persuaded them to build his one-off 300F Convertible. This is the only 300F Convertible in existence equipped with the 400-horsepower, 413-cubic-inch V-8 and a four-speed manual. It also has a fully documented history from new.

1957 Ford Supercharged Custom Tudor Sedan

This is another rarity that Robson managed to get his hands on, although not as rare as the one-of-one Chrysler 300F Convertible above. Due to NASCAR regulation changes in 1958 in NASCAR, Ford only built the Supercharged Custom Tudor for one year. The idea for a supercharged V-8 came about Robert McNamara ordered 100 copies of Ford's 312-cubic-inch, Thunderbird Special V-8 be fitted with superchargers in order to take on the more powerful Chevrolet competitors in 1957.

McNamara's idea for forced induction worked as it increased the V-8's output to around 340 horsepower, up from 270. In this spec, the Ford's dominated the NASCAR season, winning 27 out of a total 52 races. Of course in order to compete in NASCAR, the engine had to be homologated, and as such, Ford offered the supercharged, Thunderbird V-8 in every vehicle in its lineup. The engine disappeared in 1958 however, as NASCAR officials banned forced induction, multiple carburetors, and fuel injection, making the supercharged V-8 a rare one year option.

1962 Pontiac Grand Prix Super Duty

Pontiac's Super Duty models were the top-of-the-line performance models, generally using equipment pulled directly from the track. The 1962 Pontiac Grand Prix Super Duty is no exception as the 421-cubic-inch V-8 was pulled directly from NASCAR in order to homologate the engine. In fact, a disclaimer on the Super Duty option sheet read: "These engines are special-purpose engines only and are not intended for highway or general passenger use."

With only hardcore enthusiasts purchasing the cars, a total of 177 cars were sold with the outrageous engine -- with only 16 of them finding their way into Grand Prixes. Like the Fuelie Corvette above, the racer crowd that bought these vehicles means that survivors are far and few between. Estimates suggest no more than five of these rare muscle cars exist today.

Source RM Auctions

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