I am building a 427 based of a 454 block using factory steel crank dog bone rods and 11.0 to 1 speed pro pistons. I haven built a bbc yet and looking for some input. I have 781 heads may clean the ports up but not doing major work on them may go after market later. I dont have an intake yet but have a holley 750 hp carb. need help with a flat tappet cam selection. It is not driven daily on street have a 3500 convertor and will be going in a G-body. The rear gears will be changed currently have highway gearing that came with the car probably 3.08's.