Can you use stock rockers with aftermarket aluminum heads?

IQ52 said
Those adjustable rockers are from the super secret, solid cammed, 383-426 factory flexi-stroker B-engine. It was a 383 engine with a flex-able throw crankshaft that was 383ci at 817rpm idle and stretched out to 426ci by 6,254.7rpm.

Did it have like a dial back stroke knob?.. So if you really didn't need to do all out stroking you could just chub it up a little at a time?