Al is correct. HP/CID will always favor the SB. BUT... At equal displacement the bigger bore will ALWAYS make more power. Always. I don't even know why this is argued.

If you can run a small displacement BB or a big displacement BB I'm picking the BB every single time. I don't give a single crap what the HP/CID is.

I'll always take the biggest bores, the widest bore spacing and the biggest intake valve I can get. That makes horsepower. And horsepower always wins...if you can get it to hook.

Look at the turbo guys switching to big singles. They don't have to pull as much power out down low as the big single turbo doesn't make as much power down low.