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I was going to do that to mine at one point, but parts are WAY too much for 6's in general, and especially for one that had limited production numbers in the first place. They are based on a Chevy 6 block, but there are a number of differences that I don't recall. I knew a guy with a 67 Tempest that had the 4 bbl./4 spd. combo and it ran pretty good.