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Im looking into this as possibulity of putting a carb'ed 460 with auto into the truck. If i do this i'll be building the 302 to go into a foxbody. mustang.
The HO in my '85 notch was more than enough to get stupid/hurt.
If you want more, build a 347 or get a 351.
As for your truck I have to agree with the other guys.
After installing new frame perches, engine, tranny, driveshaft, radiator, exhaust system, springs to hold it up etc.. you still don't have the brakes, sway bars or gearing to do what you're asking of it.
Sell the LD and get something better suited.