I had an unbuilt '70 GP in my stash for about 30 years, and I re-homed it on eBay not long ago. I built the '72 as a new kit as a kid. I love the lines of the car. My mom's half nephew (?) inexplicably bought a new one every year from 70-72 and they were all light blue with a white interior and vinyl top. Why buy a new car every year when your neighbors won't recognize it from your old one?
I brought that 70 out at least every six months for the last 5-6 years and tried to figure out how I could build it with a better chassis, more realistic engine, air conditioning, etc. I gave up every time.
If Round2 did a Grand Prix, i would like to see something like the 63 Nova Craftsman Plus. Get an engine plate from the promo, the chassis with the separate exhaust and rear end like the kit, and some newly tooled Rally II wheels. I would be all over that. Same thing for the MPC GTOs.