Cheaper, yes, but I don't feel that is as good a solution. Different pad compounds behave differently as temperatures rise and fall, which would also shift the bias around somewhat unpredictably. With a little less rear piston area, the bias should be consistently shifted forward.
An old ponycar's last problem is power - I'm sure with headers, exhaust, and a solidly (but legally) rebuilt motor, you'd have more than enough power. Most cars in the class are below 200whp - but they are also small, light, with great handling and braking. Power is not that important in autocross.
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