Brick, generally boring an engine is to make the cylinders round again. if the engines cylinders are worn, & you bore it out to correct the problem, the power youll feel is from the fesh tight pistons/rings & cylinders. but if you had say for example a good running low mileage 350, took it apart, bored it .030 over & put in new replacement pistons, you wouldnt likely notice any gain in power.
even on a fairly healthy 1hp per CI street performer,youll only see 5-6 HP gain per .030 over bore.
alot of aftermarket intakes look like stock standerd 4 barrel intakes, but generally aftermarket dual plain intake make more power above 5000 RPMs than most stock intakes do. John