You are finding out why some very experienced engine builders that I know will not use Morel HR's in anything.
6300rpms is solid lifter territory considering the weight and mass of the Pontiac valve train.
ALL of the Morel lifter equipped engines I've built, dyno'd, and owned were pretty much done at 5800rpm's with standard weight valve train parts. Even going to beehive springs and retainers you may get 200-400 more RPM's out of them but you are on shaky ground there.....IMHO.
Put a set of Crower HIPPO's in it and last at .003" and it will rev well past 6000rpm's w/o any issues.
You can also "crutch" the scenario by tight lashing the Morel HR's. Adjust them with a .010" feeler gauge between the rocker and valve tip and they may be OK, but at that point you'd be better off with HIPPO's.....IMHO.....
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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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