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Only the sub compact cars used tube chassis early on. The Hill Duster is from 1975.
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Not sure where you got that info from, after Pomona in 1972, most, if not all of the serious pro stock cars were started as tube cars. I'd call class I stock frame regardless of year, and class II tube cars regardless of year, because you could have had it either way back then. The picture may be from 1975, but the Leal/Hill car pictured was started at Butler's late 1972. Our car is still in process, might be able to make a late October race.