I have a 97 F250 HD and was wondering if I would have any issues putting a 1990 460 from an F350 in it? I’m assuming the only difference would be OBD II.
So I'd recommend using the 1990 long block, and put everything else on from the 1997. I'm not an expert on the 460, but from 1990-1997, the tech on the other (smaller) v8's changed, so sensors are in different places and things like that. Swap out all the intakes, valve covers, electronics, and only use the long block on that 1990.