I've been collecting Fiero model kits for a little while now and came across a set of Pace car decals. My plan is to use a couple of my MPC kits to make it happen although I might be easier to use a Monogram 85 GT as the donor kit because the 84 notchie will have to have the GT style nose and skirts grafted on. Has anyone built a 1/25 Pace car and if so, what did you do to pull it together?

I haven't built one, but I would use the 85GT kit as you suggested, and just grab the Duke and the decklid from the 84 kit.
Otherwise, the GT should be nearly identical to the Indy.

I would just have to figure out the deck lid vents. The only other issue is scale as the Monogram is 1/24 and the MPC is 1/25, that Iron Duke looks tiny in there.