Good numbers and the Speedmaster heads seem pretty capable as it didn't need a lot of cam either.
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Way back when the KRE's first came out a 400 build made right at 450hp with the 221/229/112 Crower cam about 10 more HP with the 228/235/112 cam. Torque peaked in the 460-470 range. They didn't like much timing either, right around 30-32 degrees nearly as I can remember......
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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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