It’s definitely a Bryant crank. Most of those don’t have a flywheel locating register or converter hub on the rear. The largest bore I’ve seen on a factory block was 4.400 but it wasn’t a high hp engine or a stroker.
I run this combo. 4.500 stroke, 2.200” rod journals, Molnar H-beams and an internal 1/2” milodon pickup. It’s been 8000rpm with no oiling issues and regularly sees 7200. The pickup boss is slightly re-angled in a megablock.