Just got the intercooler installed. Turned the boost back up to 15psi and tuned the carb to it so it stays nice and rich. Runs like a top but is ruining the block. The rings are taking a beating and blowby is becoming a lot more apparent. The oil still looks pretty clean though so I don't think I've broken anything. I'm saving up to finish rebuilding that other block and I found a set of apparently forged pistons for my 250. They're from the later era with the integral head and it has "0.015 higher compression distance but I don't know if that would be enough for it to hit the head when it's all bolted on. It seems like it wouldn't be a problem with that thickish fel-pro gasket with the metal rings built in and it would just raise the compression some.

Is this something that would work in the older style blocks without much (or any) modification?
http://www.ebay.com/itm/CHEVY-250-FORGED...1428cff&vxp=mtr

here are some pictures
BEFORE


AFTER


69 Buick Special Deluxe. Intercooled Turbo Chevy 250 @ 15psi on a stock long block. It's kinda fast.