Setup for 273

cam arrived this week so I installed it yesterday. also new timing chain.

I organiced a Set of 318 heads because
my old ones weren't the Same year with Different bolts at the intake Manifold.

the rockers are looking much more robuster. also hard valve Seats.

the Problem is more Volume so i will lose
compession.

how much do I have to mile down the heads ? read that .005 reduce the chamber 1 cc ?

decided to use solid lifters for the cam but how do i Set the valve lash now ? adj. rods?
regards