i am spraying 150 shot, and possibly a second stage, with a cam (and heads down the road.)

a stall and injectors/pump are all on there way, but my question is.

how would it compare placing forged rods/pistons in my current 40,000 mile block vs. getting a new block ?
i figure it would be much cheaper to just have rods/pistons put in, but most people seem to just get a new block all together.

sry if im not making sense, just trying to plan ahead, so that i have less down time, when it does crap out.

thanks
ross