What cam to use in a 318

^^^
I’ve seen em hit at .470 true valve lift, and seen some ok at .512 true lift. Because of the horrible pushrod angle, you have to measure at the valve and not just go by the lift on the cam card. As with anything engine building, the correct answer is, you have to measure.
^^^ This Right Here^^^ And sometimes in places you don’t even expect, like the pushrod holes.