Ok i am headed to the track tonight, just wanna see what you guys think it will do

383
10.7-1 CR
ported vortec heads
comp cam 272/292 .498/.510 @.500
crane full roller rockers
holley 830 DP
Rpm air gap intake
3500 stall
manual valve body
msd 6A, Dizzy, blaster 2 coil
36* timing
stock 2.23 rear, and susp.

I am also at 5000 ft above sea level. what do you guys think

 

low-mid 13's?

Unless your rear is really a 3.23, not a 2.23, then hi-12's/low-13's.

 

You have a 3.23 rear

What trans?

 

5000 ft will kill the times, i have no idea what to expect

on sealevel or so, i'd expect mid 12's atleast, car could use more gear. Also depending on launch/weight etc

up there, i'm gonna guess lower 13's

 

the stall will help plenty... although not familiar with 5000ft above sea level.
with any kind of tires, 12.8-12.9 trapping 104-106
no tires, 13.2 about the same trap.
12 second car is pretty respectable

EDIT: assuming 3.23

 

That cam is going to be a high winder - so you need to gear it higher...

The most important item you need to understand is tuning. Getting the timing, air/fuel ratio, exhaust, and traction right can turn a high 13 second car (which is what it will run at your altitude) into a low 12 second one.