The progress on my 74 SB has been off/on. I have tried to rebuild and upgrade whole systems at a time to avoid the "weak link" syndrome.
My engine is .060 over w/TFS, AG, Demon, 218-224HR w/1.6RRs, M21
w/3:55 and forged bottom end. Even w/2"RHs and beat up duals w/H pipe:
280rwhp and 315rwtq...