I am new to posting. Havent done a whole lot because the car is coming along ver, very slow. I am getting closer to a complete car. I will get the car dynoed by the first or second week on june (I hope). Any educated quesses on power?

350 bored .30 over
eagle 383 forged kit
lt4 hot cam
comp lifters
comp aluminum 1.6 roller rockers
stock vortec heads modified for .525 lift
quick fuel 750cfm carb
summit racing mech fuel pump
edelbrock tes headers 3" back to magnaflow muffler with dual 2 1/2 outs
hei with 65k coil
aluminum underdrive pulleys
no cat or smog stuff still running a/c
electric fans, 3 row aluminum radiator

Havent seen the motor yet. A buudies cousin works in the family machine shop and hes doing off the books so dad wont know, so it's taking a little longer than I hoped.

 

300-315whp. Headers are gonna hurt that combo alittle. Cam and heads are likely capable of 330's. just a guess

 

Why might the headers hurt this combo? I am new to all this so sorry for the questions.