Ford uses Navistar diesels built by International. The earlier ones were known as IDI, which stands for InDirect Injection but the switch to the Powerstroke came in '94 I believe.
The 6BT is the Cummins
engine that Dodge chose for their trucks, though there was also an industrial version used in many different pieces of equipment. The 4BT is exactly the same
engine except with two fewer cylinders. It was primarily an industrial engine, though it also found its way into many bread vans and the like, some even running a Ford chassis which meant they came with Ford trannies attached. You'd be very lucky to find a Cummins in the wrecking yard, they just don't seem to show up there. They're in such high demand that they're usually sold from a wrecked truck long before the carcass winds up in the boneyard.
The 460 isn't a bad choice and is also a straight bolt-in swap with the correct
engine perches. You'll also need a matching tranny, the 460 shared its bellhousing pattern with the 429, 400 and 351M.
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