What no one has looked at here is torque values, given a 900HP b/blk and the same 900HP s/blk in a 3400lb car the b/blk will get to the finish line first in almost every case, because getting to the other end requires torque more than HP in a heavy car.
You can get 800 ft.lbs. torque form a 900HP b/blk where as a s/blk will struggle to get 700 ft.lbs..
You would have to spend $10,000.00 min. on parts alone to build 900hp with a s/blk and i believe a b/blk can be built for about $7,500.00 in parts. So the budget minded can go faster cheaper with a b/blk. but it sure is fun to outrun a b/blk (SOMETIMES) with a s/blk. I wouldn't mine having a b/blk but the only parts i have for one is a hilborn stacks injection unit and valve covers.
Zip.
PS> I still like s/blks