factory 72 340 pistons???

Look like the trws I used in one of my 340s. Mine were even with the deck with the 4 deep valve reliefs and with 63 cc heads I ended up with 9.8:1 static compression. Ran a comp XE284H .507/.510 cam and thing ran very strong and had 150 lbs of cylinder pressure. Was about rite for our crappy gas
thats the exact same cam i have. I know the pistons are at least even if not up some. which brings me to some questions. My original plans were to put MP thin gaskets (which i already have) and have .020-.030 taken off the heads. should i still do that????