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Which are fresh, because i'm doing all this right now.
The forged pistons come in standard or .020 overbore. Upon dismantling my block, we found that even after 104K hard miles, the stock hatchings were still very apparent, there was no wear ridge, and zero out of round. I probably could have used stock bore pistons. With the stock bore pistons, you have to re-hone the block anyway, as the forged must have a greater piston-to-bore clearance (Forgings expand greater amounts under heat than cast, due to density- we actually did .021, just for clearance).
Unless you have spun a main or rod bearing or otherwised caused damage to your crank (and it's not a matter of "might" - if you have, you'll KNOW), don't bother with the .010 undersized bearings. Our cranks are very tough, and even after (once again) 104K hard miles, my crank was still 100% in spec and only took a little 400 grit to clean up the journals.
The .020 overbore in and of itself will do nothing for your performance. it's more of a safeguard against previous wear, so no matter how many miles, etc, after honing .020 over it'll be fresh and new. Some people have used stock bore pistons, bores machined for the extra clearnace needed, and had no problems.
There is no price difference between standard and .020 over, but it may save you a buck or two on the machine work.
All of these obersevations are mine alone, from working on my motor. Differences are to be expected with any other vehicle, due to maintenance and driving style diferences. Aside from the cracked #2 piston, there was absolutely nothing wrong or out of spec with my motor, even after (here we go again) 104K hard miles. _____________________________________________ -Dino Yancey Hello me, it's Me Again!

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