Need big block help.

Take some time to read through this, it will give you some idea of what you can do with a motorhome engine. There are better options than the 509 cam we used, but it was laying around and never going to be used so threw it in to see what would happen.

http://www.forabodiesonly.com/mopar/showthread.php?t=249866&highlight=1972+440

This will not answer all your questions, but it may help some.