...cam, youre wrong.
yes, you could probably get away with bumping up the octane and running a 3.4 pulley. however, bumping up the octane by one or two points will net you nothing and youre better off on a stock pulley. you wont be able to get any real amount of octane unless you mix your own race gas and use a few gallons of that every tank.
therefore, dont even debate it and work slowly by accumulating parts and then putting them all on later.