I am planning on using Comp Cams part number cca-cl33-238-4
Competition Cams Xtreme Energy Cam and Lifter Kits Cam and Lifters, Hydraulic Flat Tappet, Advertised Duration 262/ 270, Lift .513/ .520, Ford, Big Block FE, Kit.

For now I have the stock valves and springs, but need advice!