just a heads up on the RHS LA-X heads (standard la intake works but need magnum head bolts), not sure if its been covered elsewhere but im putting a pair on my 318 with comp 978 springs and i need to get special rockers to clear the retainers. supposedly the rockers are designed for this head. they cost $350 just for rockers no shafts and they still rub so i will need to grind a little for clearance. also im on my 3rd set of pushrods because no one can seem to tell me what i need and now im getting custom made 7 3/4" long ball and cup rods that should finally solve my issues. they have not been the direct bolt on i was promised. just something to consider, also a beehive spring might solve clearance issue