I'm running the CCS-1 cam in my 261, 848 head, coolant passage drill, 261 valve train, springs, exhaust valve rotator with stainless exhaust valves.
Runs strong, smooth idle.
I have the same set up on an "848" head for a .060 over 235 I'm building. It uses NOS 1.940 intake valves from a '53 235, milled .040.