The 2+2/Aero Coupe Monte Carlo were the same idea as the Torino Talladega, Plymouth Super Bird Road Runner, Dodge Daytona Charger, Mercury Cyclone spoiler in the 69/70 model years. These cars were all cosidered ugly when built, sold very poorly. They had a sloped front end, and some type of rear aero spoiler to be an advanage on NASCAR superspeedways where aero was just as important as HP.
NASCAR said any of these body styles had to be available for sale to the general public as street cars, as well as they had to build a minimum of 500 copies. Therein lies the reason that these cars were limited production numbers. As has been said limited production, doesn't automatically make a car desireable.
The Daytona Chargers/ Plymouth Superbirds sat on dealer lots for sometimes a year, or more, before they sold finally. The factory alloted them to major dealers, and they had to take their allotment, like it or not. Back in the day they were sold at around cost, because most customers disliked the looks of them, plus with all the limited production parts they used, they were priced higher than the conventional street cars.
In the case of the 2+2 they did at least use a V8 engine, but it was the low HP base engine, not even an H/O engine.
Evidentially at the time GM was willing to build these cars to satify their NASCAR engineers, in an effort to keep GM competitive.
Before Petty Jumped ship to GM, chrysler threw the 78-79 Magnum out to try to keep Petty cars up front in a chrysler car. The Magnum was mediocre, and Petty went over to GM.
