factory 72 340 pistons???

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????

If they are stock iron heads, I personally would. In stock form they are about 70 cc. Get them down around 65 cc or less so you will have close to 10:1 compression. JMO Be able to build a nice stout 340 using the parts you already own