Ok well im looking at getting a LT1 Trans Am and it has some mods to it and im looking at building it up and everything and by like next month it should have all of the following...
-Jet Hot Long Tubes
-Hooker Catback
-MSD ignition
-Dual nozzle inlet nitrous system 150 shot
-K&N cold air intake
-Rebuilt 4l60e tranny w/ shift kit
-3000 RPM stall
-Newly built rear w/ 3.23 gears
-and then looking at adding something like a 224/230 cam or something.

Any ideas on what this would run in the 1/4 mile with and without the N20?
Any idea on the HP also?

 

I would say about 12.5 without nitrous if you can hook up, and then about 11.5 on the juice, again your gonna need some very sticky tires.

Hp would prob be around 320-330 ish at the wheels.