Rebuild the short block stock w/ high vol oil pump & moly rings. Have a 3 angle valve job done on the 305 heads w/ springs to match the cam and new seals.Select a mild cam.I had this motor w/ a cam 280/290dur 214/224dur @ 050 .443/.465lift 112sep. This motor run like a raped ape!!
Toms right keep it to 5000rpm.Also your stock intake & carb should work fine to 5000rpm.Get 1 5/8" headers.