What do you think my car will run?

71blueduster said
71 Duster will weigh about 3200 pounds (w/o driver)

340 bored 30 over
10.5-1 pistons (about 9.5 acutual im guessing)
x heads with a little porting done to them
XE268 cam
torker 340 intake
eddy performer 750
summit headers with 2.5 inch exhaust
727 auto rebuilt with shift kit
either a mopar 175k convertor or something similar that stalls at 25-2800
8-1/4 sure grip with 3.91s
Indy Firehawk Tires 295-50r15s on rear about 26.7 inches tall
Click to expand...

With slicks, I would think you should be able to get into the 12s, maybe even mid 12s.

My Duster is lighter (3100 with driver), with a 360, same heads as you, smaller cam, dual plane intake, 8-1/4 with 3.91s, around 9.5:1 compression and a vacuum secondary Holley 750. With slicks a converter that only stalled around 2200-2500 I ran low 12s.