power valve makes my 440 ping??

hi fellas happy new year!
I have bin doin some thinking, sins the intake is cheap crap and only needs minimal effort to remove it. Im thinking i'll have the gasket faces of the manifold milled to compensate for the heads not being milled, now I have to ask the question, do I compensate for the block being milled as well? or just the amount the heads were milled?
the block had 40thou off it to get the pistons up to .000 and the heads had 25thou off em to get the quench right.
40 thou is a size-able cut so I just thout id ask your opinion before I go to the machine shop.(not the same shop, a mopar guy this time)

and on the other subject, the fuel pressure creeping up.
has anyone had the same problem? my thorts are it needs a return line.
carter say nothing about pressure creep with this pump, in fact they don't even recommend a reg, its ment to be self governing.??