I have a 1984 Imperial. I could possibly scan the Owner's Manual for you. However, it isn't very big and is quite general in nature. Does your Imperial have the dual fuel option, gasoline and propane? That is covered in the manual. There really isn't much difference between the two years. Two things I would suggest you look at on your rig:
1. Is the rubber on the Mor/Ryde tag axle secure? Go to the Mor/Ryde website and look at their PDF files.
2. Has an electric fuel pump been added near the gas tank? If not, you might want to consider one. Check out this website for info on the P-30 chassis.
I would suggest you copy the pdf file to your computer. You will be referring to it often.
Good luck with your purchase. I'm still working on mine in hopes of getting it ready for spring. There is always something that needs fixing, but that is part of the fun of owning one.