13.3's to 11.8's to Forget it...
IMO, The only real obstacle to the 11’s with 318wills proposal is the gears.
It wouldn’t be hard at all to run 11’s with an a body using a stock stroke 360...... if the cam/converter/gear choices are wide open.
The real challenge as I see it is, coming up with a budget friendly combo that will run the number with 3.55’s.
People these days are spoiled by the way newer muscle cars with overdrive transmissions go down the highway.
4.10’s in a street car seems unimaginable nowadays....... but that was pretty normal gear in the peak of the muscle car era.
My dad bought a 1968 ss 396/350hp new.
4 speed/4.10’s...... no special order....bought it off the showroom floor. This was the family car.
They also had a 396/375hp with 4 speed/4.56’s sitting there on the lot.
At that time, a friend of his had a 67 Vette 427/435hp 4 speed/4.56’s......... was his daily driver.
All A12 cars came with 4.10’s.
These were normal gears when these cars were new.