1967 gto swap 400 with a 1972 455 pontiac motor from grand prix
unable to use hooker headers or ram air exhaust manifolds,they hit crossmember??
had to use engine mounts from the gto/they seem to bolt up(holes shallow???)
engine & trans mount spacing seems ok/drive shaft length looks good/only option seems to be oe manifolds/will they hit???
The 455 is a big block- isn't the 400 a small block? just guessin, I really only pay attention to Italian cars-
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