I used factory 1960s-1970s cast iron manifolds to install a 1976 400 with a T400 trans in a 1957 Chieftain. I used Indian Adventures motor mounts which are no longer available. They mounted to the sides of the block and moved the mounting location forward and used a simple round rubber mount like a street rod. I kept raising the block height a little at a time until the exhaust manifold cleared.
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