I should have posted this earlier but time didn't really permit.

I just picked up a set of pistons off of ebay. They're out of a chevy 307, 30 over. The buyer said (and backed up with pics) that the engine had had a rod let lose and two of the pistons were damaged. Basically I have 6 good pistons from a 307. Lightened, forged, racing pistons basically.

My engine is a 1979 250 L6 from a camaro. Mom's old car, I know how it's been treated. So I know it's stock bore. When it gets a little more tired I'm thinking I'd bore it to 30 over and use these pistons. I know what the 307 had the same bore as the 250 and in theory should work.

Has anyone ever done this? I believe I've read about it being done but I'm not sure I've seen any examples of it. Are there any special things I need to worry about? Good/bad? Is it really as easy as simply putting these in? (no special tricks from the normal). And since they're from ebay are there things I can do to get them checked? Do machine shops have ways to test pistons? This is my first engine and even though it could be a bit before I do it I wanna know everything there is to know about it. Thanks!