Quote Originally Posted by Dr Terry View Post
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If you are running a different cam, carby or exhaust, then a different mechanical (centrifugal) advance curve is required. No amount of changes to initial timing will overcome the problem. With the wrong curve, if you retard the distributor enough to eliminate pinging then you lose power. You can't have both.

Dr Terry
Getting the dizzy regraphed is the most overlooked thing when most people play with there engines,
I've had mine regraphed several times .
I have also found that the best way for me to set the timing is to have it at 3000rpm then set@ around 34degrees advanced then play with it from there going up /down looking for a maximum power with out pinging,My harmonic balancer is marked a full 360 degrees...