Crazy? No.
It’s a bit of a stretch but if the engine size and combo are conducive with a high rpm ability of all the parts on/in it, I’d guess there would be a few people out there that could make it happen. I don’t see many motor heads achieving this alone.
The thing is, the rough rule of thumb is 2hp per 1cfm of head flow which has us at 638hp. Making up the power adds up to 375cfm head for 750 hp. The missing 112hp is a lot!
What does it take to exceed the 2hp per cfm?
A lot more than I know! Certainly a lot better build than I normally have.