Inputs on a home built 318 for red light to red light fun
As of right now I need to be 7.99 1/8 Mile or better
My 367HO 68 Barracuda went 7.92@93mph @ 3457pounds raceweight and 930 ft. My 60ft was 2.2/2.4
Your Early-A may come in at 400pounds less raceweight. The Wallace says that @3250 and 7.99, that will take 315 Flywheel hp. But I'm pretty sure that calculator is based on SS suspension, so with street suspension, you will lose about a half second in the 60ft. To compensate for that, you might need another 75 hp, to total 390.
With a 318, that is doable, but yur asking a lot from iron heads and 10.5 Scr.
And, for you, the 60ft is a big deal. To try and get those skinny 255s to hook, you may have to spend a lot of money to make up that 1/2 second.
More gears and or more closely-spaced gears will help to keep your average hp up, which will also help to reduce your ET.