chinese 1.6 steel roller rockers & RHoads lifters

You're going to be lugging the engine so badly at highway speed, it's going to ruin the efficiency altogether. I cannot get you to understand that. Even if you go with the 2.76, your final ratio in high gear (OD) is going to be 2.01. If you get a strong head wind, you'll have to down shift. The mileage will suffer terribly. You're not going to like it.
I have the transmissions, and am under the impression that it will be in third gear most often.
The write-ups say even slant six 225's would wear/brake the secondary shafts of overdrive over time.
I promise a write up of "RUSTYRATROD WAS RIGHT" when I find out. The goal is to duplicate the C-body's with 360's and 2.76's

I was thinking that up hill or acceleration should not be accomplished in OverDrive gear