dano said

The 460 never came in a 4x4's until the 80's so someone transplanted it. Dual Dana's are uncommon too. Your truck likely came with a 351m or 400 maybe even a 300 I6. I have a 460 in my 79' F-150 4x4 SWB with a ZF5 speed and love it, but I built it. Hands down keep the 460. Nothing against the 440 but the 460 is a great motor and no need to change. Like all late 70's engines including 440's and 400's they suffered from low compression, emissions etc. When built properly they hold their own. Small cam, Performer intake, lightly ported heads, 9:1 static compression can get you 425 hp and about 520 ft/lbs of torq. This is what I built for my 5000lbs truck. I wouldn't say a 440 has a greater advantage over the 385 Ford engine family (370/429/460). There are actually more aftermarket heads for a 385 than the B/RB. But a lot of those are Cobra Jet Port or Hemi heads for truck pulling, racing etc. Stoker kits from 513 to 545 CID in the stock block. Like all engines they have their strengths and weaknesses in stock and modified form.

Go here and spend a few days reading:

460 Ford Forum

Regarding the Cummins swap, your putting a 1100lbs engine where a 600lbs was deigned to be. So a drop in swap should be avoided with out gusseting the frame.

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