It is a Toyota 4Y Engine also....

I was able to look at the Toyota today. It's not a EFI engine. Older basic carb/throttle body (big fat screw up top, wheel and threaded shaft at the base). Truck tends to have a bad miss when the timing is slightly retarded. I advanced it all she could go and she smoothed out a lot but not 100%. Throttle response is very slow also.

I pulled the cap off and the distributor up just so the rotor would rotate cause I was going to jump it a tooth. Could not get the distributor to seat back down 100%, only about 80%. Almost 1/2 rotation and still wouldn't seat in, so I put it back the way it was. I never pulled the distributor out all the way to see exactly what was going on. Does this sound right on a Toyota to have to rotate the distributor rotor. That much? Would it have seated in if I'd went a little more?

I was told today that ever since the engine was rebuilt, it never had power. Now I'm leaning towards engine timing. Any suggestions here?

I don't think low fuel pressure would cause that. I would check to make sure the throttle is opening all the way and the ignition timing.