Agree with Gus68, keep it stock with maybe a nice medium sized cam. (Around 450 -460 lift or so with a bit of extra duration and about 112 separation.) Avoid all the mods by just running a consistent mix of octain booster. Check the head charts, 670s are one of the best heads for a moderate cam. Either way you go, would suggest hardened valve seats. IMHO Best of luck!
