My vote would be to spend the minimum necessary to have the 440 as reliable clean runner leaving some cash available for the other projects. For all you would put into a 512 stroker, what do you really get out of it? If you're drag racing, all it does is change the dial-in number on your window. An old 392 hemi in the A might be just about as quick as the Satellite, if that's what you want to do.