1958-1965. Mainly 2 ton and larger. Expect it to be more costly than a smallblock, as parts are somewhat difficlt to find. Another option, and possibly easier to find, would be to look for a passenger car version, used '58-'61, or the 409, '61-'65. I came across one once at a Corvette show at McCormick place in Chicago. The asking price was $2500. That one was a 2X4bbl 425hp 409 out of an Impala SS.
