SB vs BB who wins?

Again, you don’t have a clue. Like I said, geometry matters.

The deck is way too tall even on a B engine for that short stroke. Ever consider ring seal?

So I’ll do a 3.5 inch stroke small block and turn it 8k. You going to do that with 400 inches and that top heavy piston?

You have a lot to learn about building horsepower.
Nope. I would build a lightweight rod long rod motor, hockey puck piston 400 grams lighter than stock, spin it 8,000 too, and do everything your small block does, only bigger. Why do you think a small block can turn more rpm than a big block? Have you not heard of 11,000 rpm big blocks? (Otherwise known as pro stock?)
Small blocks are terrific, how many are there in prostock?