Ok after a lot of digging in internet land... in case anyone else is looking for the same info.
What engine mounts: Same as the 283 front mount to cross member.
Others can be used but that would require making holes or welding.
What radiator shroud: Original 283 can be cut down or there were original thinner ones fan should be half in and half out of the shroud.
Exhaust manifolds: I have read that folks have ground and tig welded a manifold with success.
Last edited by 59ApacheGail; 07/29/2015 2:52 PM.