'69 225 into a Valiant with a 170

Hey guys, can I ask you somethings? I own a 1965 Plymouth Valiant with a 170ci and 3 on the tree. The motor in the car is trash and I've been looking for another /6 for a while. I've now found a 225ci from a 1969 Dart, which was married to an automatic transmission. Since I still have the 170, will I need anything that I don't already have to drop the 225 in and mate it to the 3 speed manual tranny?
Thanks for reading!