Sucks not knowing which way to go? I'd be opting for a cam change. Moving a cam around in most cases just shifts the power curves. That cam is a TURD in a 455, from my direct testing. Some would deem it a good or even great choice, my direct experience tells me it's too small and LSA too tight for a big CID build with any kind of commpression in it at all.
The 428 is a different animal, but they LOVE to rev, much like 400's, but have cid to produce great mid-range torque. No matter where the cam is degreed, the short seat to seat and 224/230 duration just isn't going to make an strong top end charge in that big of an engine.
FWIW, we built a 428 here couple of years ago, unporte KRE heads, iron intake, q-jet, 10.6 to 1 SCR, 236/242/110 HR cam. 497hp and over 530ft lbs tq. The owner has it in an early GTO with 3.73's and a 4 speed. Has zero traction in low gear, and no problem busting the tires loose in the higher gears on the street. He absolutely LOVES the build, but keep in mid the drivetrain parts are well chosen for the engines power curve......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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