I agree with homeboy,
I think your car will run in the high 14 range,
but i don't know what kind of rear gears you have,
I know that a stock 350 with intake, headers, and a 4 brrl will do about that with very mild gearing. I would'nt mess with your tire pressure unless you are runnin' slicks, if you are running radials, leave the stock pressure in there.
I'm from Pontiac man, do you live in stanton,
I've gone to MMM for several years for events like the pure stock muscle car drags and stuff like that.
Keep on roddin'!~ <img src="graemlins/pimp.gif" border="0" alt="[pimp]" />