Most full roller rockers will fit under stock covers. Some may require some material removed from them behind the pushrod cups. That's superficial back there and woln't effect strength.
Most don't fit because the locknuts are too long, or the studs, or combinations of both. In most cases I can usually shorten up the locknuts and install a thicker valve cover gasket and good to go. Other set-ups may require more work. With all the different parts out there these days, and little if any of it being made to any particular "standard", expect to do some custom fitting when you purchase aftermarket parts, especially full roller rocker arms.......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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