Cam advice wanted

Autopar,

What Casting Numbers are on those 360 Cylinder Heads {#4027596}. ???

Having the head surface 'cleaned up' is probably a smart thing to do, especially
if you're going to use a thin 'shim-type' Head Gasket.

The thin 'shim-type' Head Gasket {.025"} versus the Fel-Pro Head Gasket {.039"}
is about {.25} in Compression difference.

If you have the #4027596 '360 Heads', you should have no problem getting the
surface 'cleaned-up' with the valves in-place, to provide for a proper micro-finish' surface.

If you want them milled in any significant amount........different story.