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A big block in A body is a whole lot of fun but there are many issues involved if you’re planning on running the big block with B body H P exhaust manifolds it will be a credit card fit between the shock tower and the exhaust manifold , it’s a tight fit with any exhaust manifolds or headers for that matter , and if you’re using the Edelbrock RPM intake manifold The clearance when you close your hood will be minimal if you’re not running a hood scoop . You will definitely have over heating issues with the 440 in a A body , to fix that problem I made a larger opening on the RaDiator support and ran a be cool Hemi big block A body system with two fans it comes as a complete kit around $1500 works like a charm . That whole system was in a 68 Plymouth valiant I now have a new build My 1971 Dodge dart definitely going with the 408 small block hoping to get somewhere around 500 horse power If I had to do it all over again I would definitely Go with the 408