You have to realize that the 3rd and 4th gen Camaros share a common unibody from the firewall back, specifically the floorpan, frame rails and rear suspension. The major difference between 3rd and 4th gen cars is the front suspension and body panels. The carpet, console, seats, etc all interchange. The 3rd gen cars also had huge dashboards like the 4th gen cars, so interchanging them is not as much of a hassle. The extra wide C pillar is also shared between the generations of Camaro/Firebird, so it may well be that they will interchange with minimal modifications. If you put the dash from a 4th gen Camaro or Firebird in a G body, your knees would have to have holes cut in the dash for them because it is so much wider than stock. Plus, the Camaro and Firebird are wider cars by around 8 to 10 inches as compared to a G body. If you want a Camaro, go buy one and get the interior you want. If you want a G body, stay within the boundaries of a stock appearing interior with maybe an upgrade in terms of seats, a console and a steering wheel. It will work much better and not look hacked when you are done. Plus, later GM cars used lower quality interior materials that tend to squeak and creak much more than a G body in good condition. I plan to put a set of Recaro seats and a console in my G body when I find pieces that will look right for the car. (I also plan on a 6 speed manual swap at that time to complete my ultimate G body idea, but that's another story.)To me, that Camaro in the pictures looked hacked and unfinished. It just didn't belong with that dash, and the chrome steering wheel was out of place.Oh, and GM killed it's RWD intermediates at the end of 1987, when they discontinued production in December of 87 and badged them as 88 models. The replacement cars were FWD and share virtually no parts in common with their G body predecessors.
I also agree that if you want to extensively modify a G body, buy one in run down but solid condition to mess with. Ones in good shape are getting hard to find and increasing in value, it would be a shame to ruin one if your ideas go wrong. A cheap, solid MC can usually be found for around $500 on sites like Craigslist and would make a much better starting point for this sort of idea.
