John and Cannonball,
Have you guys checked your mechanical spark advance to see if it's working?
I had problems with my truck running poor and found the weights rusted to the plate due to moisture condensating inside the dist cap. Took things apart, cleaned everything up and sprayed some teflon lube on things and all is well.
A quick check is to start the engine with your timing light hooked up and rev the engine and see if the timing mark advances as the speed goes up and then returns when you drop back to idle.
Mike B
