i was curious as to what kinda power i can expect to have out of my engine? iam running a 355 with vortec heads, rpm air gap intake rpm performer cam .488 intake and .510 exhaust and a 600 holley for the street but 750 for the track i also have a set of long tube headers

300hp no idea on torque.

Hopefully the Vortec heads have been modified to handle that lift. Stock Vortec heads with that much lift - not a pretty picture.

I'd guess, depending upon the duration of the cam, that you're going to be significantly above 300 HP, probably closer to 375. But, that's really a WAG at best.

i am not sure which duration you are asking but i belive it was 254 at .050 and 300 something at .6 i think not to sure the heads have been machined for the cam new retainers and springs i agree on the 375 atleast i read a article at popular hot rodding they had about the same set up and made 422 horse. i just ask becasue i wanted a response from someone running the same setup

1 million hp?? help me guess

254? I don't think it's that high... I think it's like 244*.050 or so... The edelbrock RPM cam.
Not a great cam, but should work pretty well in that setup.
With the long tube headers and the holley 750, i'd say 380HP ish.