If you are talking about a plymoulth Arrow truck and a ram D50 you might be able to swap they came with 2.0 and 2.6 liter engines. The 8 yeardifference might create a barrier But what you have to do is check the VIN # the 8th digits is either a U or a W if the 8th digits are the same you can bolt the bolcks up.
You may have to switch over many parts to make it work but it is possible if the VIN codes match.
