Slant 6 to 318 swap

You will also need exhaust manifolds unless you plan to use headers. The drivers side manifold is A body specific and drivers side manifolds from anything else hit the steering box, shaft, etc. There is a set for sale in the parts section from a trustworthy guy. Good luck with the swap.
[FOR SALE] - 1967 to 1969 Barracuda exhaust manifolds | For A Bodies Only Mopar Forum