[njsteve]

I sent both of my HEI distributors (from my 72 Formula and Gramma's Firebird) to Rocky Rotella out in Nebraska, who works on a lot of GM stuff. He found things that I never would have noticed just doing a driveway advance spring replacement, like the vaccuum advance unit that was working intermitently on one of them, ranging from a 2 degree to a 25 degree advance change (and it wasn't even leaking) and on the other, finding out that it was shimmed wrong from the factory. He set up the curves nicely and limited the vacuum advance to 10 degrees total over what the mechanical curve was. What a difference! Very reasonable price, too.

Between the carb restoration by Cliff's High Performance Quadrajets in Ohio and the distributor curving, the Formula REALLY woke up. To the point where it breaks the rear tires loose when the secondaries tip in, in first or second gear.

Gramma's car was only 160 horsepower to begin with but the carb resto/distributor curve really smoothed it out and gave it a couple more horsepower. There is only so much you can do with a 7 to 1 compression 1975 smog motor.