Cool I have been thinking about doing a small project like this since I have the first engine I rebuilt was a balance and blueprint rebuild on a 70 /6.

It ran like a top in the 70 Duster that I drove to college never did an mpg test on it back then ........mid 1980's and gas was alot cheaper back then.

I agree them early A bodies are the lightest I wonder out loud if the barracuda fastbacks would be worth the weight of the rear window vs the aerodynamic advantage of the sloping back window.

The lightweight aluminum case A833 OD trans would be a cool addition to the project currently I have 904 on the shelf for the /6.

EFI has been adapted IIRC someone did a project where they adapted a GM EFI deal to a slant 6 as well.