Just some guy
Join Date: Jun 2001
Location: SC foothills, USA
If you lined up the marks on the timing gears correctly, the position of the fuel pump eccentric makes no difference.
My vote is for something simple, like wrong firing order, or crossed spark plug wires. Easy to check and fix, best to start there.
If you timed it while cranking, I doubt the distributor timing is too far out (for you unbelievers, that's exactly why you would do this. Not to time the engine, just to make sure it's in the ballpark and NOT 180 out-a useful trick).
Of course the trouble may lie in the other stuff mentioned and more besides. Start with the simplest things and go from there. Carb trouble is possible, but considereing what you've been doing to the engine, it would about last on my list. Much more likely you didn't get something back together just right. Happens to everybody.
.... it wouldn't be the first time reality took theory and conjecture out behind the woodshed and gave them a good thrashing.