The rpms have angled plugs and the hooker 2 inch work on mine. The rpms like any other head will need a multi-angle valve job and springs for your cam. I have the rpms and to me they had very little foundry shift in the castings. I know nothing about the other heads only what I have read. You will need to have the intake port ported to really see any rear benefit, because the exhaust has good flow and may need very little work. With the .590 cam I think you would benefit more from the rpms than the big victors.