Slant six swap HELP!

If you're swapping the whole motor over, then the only thing that would really matter is the exhaust and the kickdown linkage. The deck on the 170 is a little shorter than the 225. Trans Bolt patterns are the same, the 225 pan should fit the 170 but there's only one way to find out for sure. Double check that that even needs to be done, the pan that's on the 170 now might just fit fine