Give me an idea of what this will be running

valiant360 said
71 valiant 4 door- completetly striped , all the underdash stuff, carpet, seats etc. stock gas tank gone , replaced with fuel cell. I dont know the weight, But I would guess atleast 200 pounds taken off.

360 bored .040 over 280/280 484. lift cam

stock heads, air gap intake, carter 625cfm carb, headers, 391 gears with sure-grip

255/50 on the back , 6 cylinder torsion bars, add a leafs on back

727 shift kit
tci break away converter, somewhere around 2400-2600 stall

If tuned correctly and shifting around 6000rpm, what would be a good guess on ET 1/4 mile time.

13.00 but you will likely need some slicks to get it. I hope you have added welded in frame connectors - big difference with traction and body twist.