I ran MW heads with a cam in the 280 range on my 514 with 15:1 compression and made well over 800 hp. But I'm not sure what would happen if you took those same parts and put them on a 440. You can argue that it should make roughly the same power at just a higher RPM, but it doesn't always work out that way. I'll be interested in seeing what the dyno sheets show. I do agree that if the OP's combination works, it is going to require a ton of stall.

I talked to a NHRA SS guy a few years back who was racing a 440+6 combo. He had roughly 10:1 compression, legal heads, exotic intake and a camshaft in the 280 range. Said it worked but he had zero torque below 5000 rpm.