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The original block/transmission is worth some money to the right person...possibly enough to fund an engine/trans swap.
If you wanted to keep it 460 and go EFI, you'll need the engine/transmission from a truck with EFI...that might get you 15-18 mpg. My Torino got 16 mpg with a three speed.
You could swap in almost any Ford set-up, including the Mustang 4 cylinder turbo, 6 cylinder Turbo Coupe, or super coupe engine/transmissions fairly easy.
It is also possible, with a little work to install a VW 1.9 diesel, with a Toyota Truck transmission and possibly get 30 mpg...but the front end will be a little light...need springs.
Another diesel engine you might consider is the "bread truck" Dodge 4 cylinder diesel 4BT...it's like the 6 cylinder diesel minus two cylinders. People put those in the big Broncos and report 30-35 mpg... You'll want to get an over drive transmission with that, too. But I think the 4BT has an SAE bellhousing that matches Ford transmissions. Possible oil pan modification needed...might hang too low. That engine probably weighs closer to the 460, so springs shouldn't be a problem.
Your stock 460 was rated about 200 hp and a lot of torque. (Torque would be more of a factor than HP)
For MPG, diesel would be the way to go. Now I'm wondering if an older/newer Ford truck 6.9/7.3 would fit in there. My friends 6.9 diesel truck gets 18mpg...
Good luck...
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