I would agree that using the Monogram parts would result in a better looking 1983. Using the 83 convertible nose with the 80 body is the way to go, could use the hood scoop from the MPC 83 kit. Rear spoiler on the 80 body looks correct for the 83. The rear seat could be cut out and replaced with sheet plastic. I have built several of the Monogram Fox body cars and by swapping noses & hoods you can up with several different versions of the cars. I've done a 80 convertible (never really made), 84 1/2 GT350 convertible, Pace car, etc. I have several "scrap" bodies of the Monogram version plus a bunch of spare parts and even multiple complete kits of all the Monogram versions. PM me with what you may be interested in. Zen