Need turbo pistons

I'm in the process of rebuilding the engine in my 88 tc. I bought the car for 500 bucks with a bad motor. The car is in jam up shape to be an 88. But anyway i pulled the head and saw it had a hole in the piston. Well today i tore it down and that piston has gotten a litlle hot. I guess someone got the timing off or something:shrug: But my question is does anyone have any pistons? I don't have the money (thanks to the price of gas) to replace all the pistons. This is a low milage engine so the rebuild should be pretty easy. But would it be okay to just replace 2 of the pistons(another is a little rough, caught some head gasket). Summit has them new for 54 bucks. Has anyone ever replaced single pistons, or better yet does anyone have any? Thanks
 
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I would say you could replace just wo pistons but I am paranoid that the weights need to be very close or it could throw off the balance.

IMHO what I would do is buy the two pistons but pull all four rods and pistons and make sure the pistons and rods are all close to the same weight.

Otherwise I would think you would have to rebalance the rotating assembly.