The 80 column should bolt right in to the 78. But, the headlight dimmer is on the floor of your 78, and it is on the column on the 80, so you'll have to run some wires to it. There is also a difference in the neutral/safety wiring in 80. Your 78 has a neutral/safety/back-up light switch on the column. The 80 doesn't. It just has a back-up light switch. So, I believe you will be able to mount your 78 switch on the 80 column.
The pulse wipers should work, but you'll have to get all the wiring off the 80 for the pulse motor and pulse switch to swap it all into your 78.
