yeah man a bore job only and you won't feel any power difference, unless of course your engine is hammered pigshit to begin with. wait till you blow a head gasket and then get a cam, so you can blow the bottom end apart.
Or just get a cam now. When I rebuilt my engine, I threw a cam in it, and did some other things, and oh man, what a difference...but I had 14HP at the rear wheel before that...and I *think* i still have the dyno sheet to prove it.