assuming car has good traction, good weather etc what kind of time would you expect from this combo? about 300 rwhp 350 rwtrq through a drag built th350 with standard gear ratio's with a 2500 stall and 5 13's in the rear, car is about 3200lbs race weight.

 

Need some tall tires to knock down that gear ratio...

But you should hit 12s easily unless no traction and the gear ratio runs out.

 

With a track tire, easy mid 12s with that power!

 

how tall of a tire? my only fear would be runnin outa gear before finishin the run

 

You're going to need close to a 31" tall tire or else you're shifting around 7500 rpm to use those gears.

Assuming your tire/gear combination is set up for 1/4 mile, your torque converter stall would be too low.

Based on a power to weight ratio, you should be able to do the 1/4 around 12.8.