A stock 2 barrel carburetor doesn't have the flow needed to support 300 hp because of the rpm's needed to do so. I don't know how much cam he's planning on running but he probably won't have enough compression to get the full benefit from the port work and the cam used. I'm not a expert but I'm sure that I won't learn anything from this build. I would take a whole different approach with the build and use factory parts other than the pistons and probably get better performance. I'm sorry about the red X I shouldn't have done that.
