another j head question

I was going to put some time and effort into a set of 302 castings I have laying around for my 360. I soon realized that The money it would take to make them flow on my 360 is out of my budget for now. I think I will save them for a nice 318 build later.
I currently have stock rebuilt j-heads with stainless valves(1.88-1.6)comp 901 springs. rebuilt less than a year ago. I have no issues with the heads as they are now except that they sit on top of factory dished pistons. I want to shave 50-60 thousandths off the heads to increase compression.
Will shaving the heads give me a decent performance upgrade? I am running spitfire headers and 2 1/4 duals so I think breathing won't be an issue.
Also will I need to worry about valve to piston clearance with a .480 lift cam? If needed I can check the clearance before assembly. I will probably be using the mopar thin gaskets too. I believe they are .024 compressed.
I will also be swapping to crane gold gold rockers. That is another reason for shaving the heads. My pushrods are 60 thousandths short which causes my adusters to sit too far down and throws off the geometry.
It will cost me $250 to get the heads milled and freshen up the valves.
Seems like a win -win situation to me.
I am also calling mrmopartech this weekend to get the specifics on the shaving. I believe there are concerns about shaving too much off the intake side of the head and causing valve cover sealing issues. I have read some of his previous posts on this and he DOES know what he's talking about.
What do you guys think? Does this sound like a a good thing to do?