I was thinking of building a heads/cam 383 with a 250 shot. But now I am beginning to think of going with a supercharged 355 with fully ported heads/cam and forged bottom end.

Let's say, and obviously I know it is hard to guesstimate, here would be my setup:
355 9 to 1 compression
Fully ported LT4 heads and intake manifold
some nice blower cam
1.6 Pro mags
Hooker Longtubes
True Duals
SY3600
P600B

What type of power would someone expect from a setup like this? What type of track times could be expected?

Also, is a turbo a lot better setup to go over a supercharger?

 

I dont know if you want to do a 250 shot

It really just depends
So many variables

You can go all track and probably get it down to the 9s but ofcourse your car wont be the least bit street drivable