how much power will i loose.

edelbrock TM7 and a holley 800 dp and dual feed. i have no idea on cam specs as i did not bulid the motor but its 13-1 compression and 30 over fully balanced msd digital 6 ignition. 4 speed trans and dana 60 rear with 456 gears.

On the street you won't notice a difference (schumacher are supposed to be good for 500) unless you plan on spinning her at 6500 plus but I am a little scepticle that the 13-1 compression is going to like the street. You're biggest worry is going to be cooling so aluminum rad and shrouded electric fans would be the ticket unless you already have,