Yeah I think Mazzolini had a 383 with B1 heads a few years back. 8500 rpm shift points or something crazy like that. I don't know what the power level was but I'm sure it was up there. A combination like that would be a good match for a big inch SB with killer heads. The inches are about the same and the head flow would probably be roughly the same. The big block has larger bore size and room for bigger valves so it might hold its own. Probably comes down to who is building the engine and who is paying the bills.