So are 72 and 71 crossovers not interchangeable? Will repro work on 71? And another puzzle: some 197 heads are drilled for 2 end exhaust bolts and some only one? what I deduce from ebay ads. I just got set that have one hole drilled, and Ram Air Ent manifolds are cast for two bolts, so I should have shop drill end hole when do heads I assume (?).
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72 Bird
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