318 combo's

I have a 318 piston to valve clearance question.

I added 308 cast heads with 1.88" intake valves that were also decked about 0.040" in an effort to raise CR......to my 72 cuda with factory original shortblock. When I added the heads, I measued pistons about 0.085" in the bore at TDC. I also added a comp cam with 0.477/0.480" lift, and I was told that I should be fine with P2V, and about 3K miles later, seems to be the case.

Anybody have a good idea how far up in the bore I can come before P2V becomes an issue, with that same cam? I am considering a new flat top that will be 0.030" in the bore. I will fully check once tore down, but just planning ahead.

Thanks