3.23 gears and stock convertor it isnt going to run anywhere close to real low 13’s. Maybe real high 13’s if i had to guess.
Back in 1972 i had a 69 340 swinger. Headers and 3.55 gears. Ran 14.23
This should run better than that no doubt. I will say 13.70’s- 13.80’s
This all assumes he has a stock convertor
I just ran 13.5's with 2.76 gears, stock converter, AND a stock 360. He has more bore, more cam, more compression, better heads. I'm sure low 13's won't be a problem, maybe he'll go high 12's.
