upgrade the head(springs retainers, cams...ect) first. and when you build the bottom end then p&p the head. that way you dont have to remove it twice. and you prolly wont be getting it retuned after each extra mod, right?

you will not lose power because of the air not having enough power to get it. it will have plenty of suck power. they problem is that the air will be going in faster than the stock ecu "thinks" it is (since it measures pressure not air flow) and thus throwing off your a/f, and decreasing power. probably by noticable amounts since a good p&p will make a BIG differance in flow.`