The '77's a good one. Lil higher compression than those following. I think at least some of em had 1 3/8 carbs. And it's the only year for that bad boy tuner. Plus parts from any newer crossflow will bolt on. With the exception of the crankshaft.
If it were me rebuilding I'd add a newer intake and Chris Carson reeds. But that's about it. Course you could always update the ignition to CD4, which is nice. Does away with all that 'boomerang' crap.
Yo Mark. 135 is not acceptable. 140 is better ...