almost no power increase for a straight displacement increase. The intake flow is kinda restricted by the heads and cams so you don't gain that much. Cams would be WAY WAY WAY cheaper and easier and give you better gains in practice.
If you have a hardon for an overbore (which should be reserved for the rebuild of your motor later on down the line) I would stay at .020 or less on modular motors. There've been way way too many heat issues with .030 and up. If you're going to spend that kind of money, go .020 over, slap some 10:1 pistons in it, and H beam rods and a cobra crank. It'll cost about 2500 bucks to do all that and you'll get a little power increase out of it. You could buy a BUILT short block from CHP or DSS for about that much and not have to buy bearings, pay for assembly, or worry about someone knowing the idiosyncratic nature of the modular motor when they're assembling it and you ending up with a possibly bad engine from the get-go.
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