How many hp do a small block 2 bolt main 350 have?

There's no single answer to how many horsepower a small-block 2-bolt main 350 Chevy engine has. The horsepower output depends entirely on the engine's specifications and modifications. A completely stock, original 350 from the factory might produce somewhere in the range of 150-250 horsepower, but that's a broad range. Modifications like the camshaft, carburetor, intake manifold, cylinder heads, and exhaust system dramatically affect horsepower. A heavily modified 2-bolt main 350 could easily produce 400 horsepower or more.