Well, that difference wasn't so great later on. Let me list the current problems (1978 cb750k-mods listed above):
-Hard starting, even after being run an hour earlier. Starter motor whirs and clicks pretty nasty, so that could be that as well, although the kick start pretty much sucks, too.
-Leaness across powerband
-Lean plugs
I'm going to unwrap the exhaust and check for cracks (which has happened before). If that isn't it, I guess I'll switch out the accelerator diaphragm. The rubber dust boot has been gone for awhile-maybe it got gummed up? It used to leak, now it doesn't-maybe it stopped working?
In any case, I'm getting pretty speed at tearing my bike down and putting it back together (even with a bolt on seat)