With the 4:10 gears the motor will spend very little time ever running under the 2000 rpm's where all his advance is in by.....
Is the motor showing any signs of detonation???
what fuel are you running???? what rpm does it idle at????
Is this street driven car???? I was assuming it was a race car but i don't know why i thought that???
If you are having problems,you will need to remove the distributor and check the advance slot under the mechanical advance and see why the distributor only has that small amount of advance in it.