I did the swap today. I put a 79 dash pad in my 84 and I did run into a few problems and here they are.
The speakers on the ends of the 84 dash would not allow the 79 dash to fit flush so they had to be removed.
The way the a/c vents went into the dash is different between the two years. I had to use a dremel to cut a lot of the 79 vent off. Both vents.
The gauge bezels are way different. I had to go to the junkyard and I got one off of a 77. Then I had to move the headlight switch on the dash down an inch to match where the hole was on the 77 bezel. Now there is a hole for the wiper switch on the dash bezel from the 77 because the wiper switch is on the turn signal stalk on the 84.
But now that it is in I love the look. Thanks