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Well the duece runs a 8.2 diesel hooked up to an 4 speed allison. And A old c60 that had the 427 had allison's also, so theoretically if i could find the adapter plate from a c60 i should be able to bolt a 454 up to the duece.
This was going to be my suggestion too. You'll get some slack for not keeping it factory over on SS... but, there is TONS of tech on that site, and guys that know the trucks inside and out.