[PeteLeathersac]

'

Good thoughts too Sam!
I hope it's not cam lobe wear too...try a gravity feed supply from above the carb or road test w/ temporary elec' pump installed?
When/how did the problem first begin...slowly worsened or all good one day/not the next?
Any chance the T'chain is off a tooth, loose and jumped or installed new and lined up w/ keyway slot not timing mark?
How's the dizzy itself, advance weights not seized and vacuum advance pot working plus points also plug gaps checked and Ok?
Unlikely w/ your year/model but exhaust obstructions can hold back revs too, sometimes clogged Cat' Converters etc on newer vehicles.
Best of luck!
[img]<<GRAEMLIN_URL>>/beers.gif[/img]
~ Pete