What Are You Doing To/With Your Car Today?

I resisted the urge to burn my piece of **** to the ground again today, it just doesn't run right, will wind right up without a problem in neutral, full throttle blips open the secondaries fine, but take it on the road and it's a complete slug. It has 4.10 gears in the rear end but it won't even break the tires under any circumstance. Getting really frustrating, I took out the MSD distributor that came with the car, put in a known good stocker, same story. I have good fuel pressure, (mechanical pump, 6 psi), fuel line is clear, new tank and sending unit, new 650 AVS2 carb. 360/727 with a mild cam and TTi headers, had the near exact combo in a Dart years ago except that one had crappy smogger heads and it was a screamer, even with a stock cast iron intake and thermoquad.
could it be transmission related? or the kickdown linkage? other than that timing advance? Just guesses. I am not too familiar with MSD I rum MP electronic distributor