Since the build was done 20 years ago most likely the pistons are dished.
I had two different 428's in my car decades ago, one had #96's on it, the other 6X-4's. Both of those engines had dished pistons. In the first engine I ran a real 744 cam with high ratio rockers, in the second engine the HO Racing HC-01A.
The 744 cammed engine was "weak" below 3000rpm's and pretty much done by 5000rpm's. Not really impressive anyplace. The second one faired better, but both of those engines needed more compression for the cams I was using in them so I really wouldn't recommend going that direction unless you just want a decent running engine that will easily manage low octane fuel and move the car from point A to point B.......FWIW......
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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