Correct me if I'm wrong, but in '67 the only Pontiac engine with dished pistons was the "Export" engine, and all others had flat tops. If so, bolting on a set of 670's is going to raise the compression ratio too high. Sounds like a miserable swap to me unless you go with new dished pistons.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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