I've been kicking this around for a daily driver fuel economy build.
I have a locked up 79 318 that I need to autopsy. But I'm thinking stock rodd and pistons. Mill block for zero deck. Stock reman magnum heads drilled for la bolt pattern
Windage tray and crank scraper to reduce parasitic losses and cam designed for torque.
Weiand dual plane and old Holley economaster or 500 edelbrock.
Not remotely close to a race machine but in a sub 3000lb mini truck with a 5 speed should get good fuel mileage and fry tires.