+1 on the valve springs. The Crower 68404 springs are the best "drop-in" spring out there for the Pontiac heads with stock components. They don't put killer pressures on the cam/lifters, and have a LOT of room for running larger than stock cams without getting anywhere near coil bind.
We built a set of #46 heads yesterday in the shop and used them. They fit all the stock parts, and with a little seat grinding and valve work very little shimming is required as they are designed to run at 1.600" installed height.......Cliff
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https://cliffshighperformance.com/
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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