My car is a 82 Z28, its got a rebuilt 350, 69cc chamber 2.02/1.6 valved heads, Edelbrock Performer Intake and 750 carb, not sure about the cam, but I think it would be close to a RV cam( good idle, lots of torque), Th-350 trany with stage 2 shift kit, stock converter, open rear end with 2.73's, 275/60R15 tires, and factory exhaust, no cat.

I think my time would be around mid to low 15's, my car weight is 3655 lbs with me in it.

Now how fast will I be when I put on my headman shorties with headman y pipe and a 3" mandrel bent exhaust, 2500 stall converter, and (if I can find one) a posi with 3.42's

Digger

 

It's hard to guess since no car was ever made like that from the factory. I would just run it to get some hard numbers, maybe it's faster than you think.

 

I hope its faster than I think. I have to wait untin Mid may before the closest track/ only track in saskatchewan opens. And that is even over 200 miles from where I live.
My guess is maybe low 14's

Digger

 

my guess is those 2.73's are really gonna kill that setup. Get some better gear and posi and with the addition of the exhaust i don't see why you couldn't hit low 14's to high 13's.