The intent for the car would not be fuel mileage. I don’t care what anybody here says, you are not gonna get good fuel mileage with a modified smallblock. 12-14mpg around town is fine by me.
The intent for the car would be able to drive at modern interstate speeds, 70+mph, without screaming at 3000+rpm’s.
I just took my old D100 on the PowerTour and with 3.23s, an A727 and 28” tall tires out back, it was turning 3000+rpm the entire time.
Not that I will be on the interstate everyday, but I want the capability.
I’m really thinking 3.23s with the overdrive are gonna get me what I want as far as hwy mph/rpm.
The question left to answer is what cam would provide a broad enough power band to cover that 3000rpm drop from 1st-2nd with the overdrive?