John my combo is identical. I've only got 3 full 1/4 mile passes(9 1/8 mile passes) on it but every time I jet up it goes faster, I'm up around 96 or 97 jets right now. I bumped the timing around and it seemed to run the same ET anywhere from 34-38 so I left it at 34.

1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual