It's only serious power if it's above 400HP My whole family is a bunch of gear heads and I happen to be one of them. I have wanted a 350 SBC since I was in elementary school. Now that I have my Malibu I can drop in a 350. My uncle is helping me build the engine so I don't screw it up in any way. He has a 1,100HP Camaro so I'm sure he knows what he's talking about.