Greg, I would talk to someone at Crane Cams about the cam you are using & find out what type of advance curve needed for your cam. Then find someone to re-curve your distributor, then time it up to what Crane recommends & see what she does! I built a '69 428 using a Comp Cams High Energy cam, run OK just putting aroung but was a dog trying to romp on. Found out that the distributor wasn't set up right for that cam. Ended up my vacuum advance was not used, it then ran it's *** off! Worth your time just to call.
