RE: Need opinions on rebuilding 440
I wish I could be of more help, but my 6-pack motor is stock except for the cam, headers and oil pump and pan. I think that the purple shaft 509 is about max on the cam if you plan for any street use. I have heard the heads from any 440 flow real well with a good decking and a clean up. The cam is pretty important. Also match valve springs with cam. Your exhaust should be no problem with what you have now. That exhaust you have is awsome. 10to1 Forged pistons and 30 over to round it out. That should put you at over 500 at the crank. Also a 7-8 quart oil pan and a melling high vol. pump. Tune that 6-pack and let her rip. Good luck and let us know how its going.