I don't understand why more teams don't build those (and Thunderbirds) up as race cars.
The IRS more than makes up for the weight difference from a Mustang, lots of the parts transfer over, and they can be had for not much money.
Bonus that you can fit just about any engine in it without too much trouble. Not sure on a straight 6, but a 300 out of an F150 should fit with a little trimming of the hood.
After 15 races, 14 checkered, 1 dnf. I can give you my impressions of the MN12 platform used as a race car.
The good: Decent handling, OK power when running the 3.8l SC or the 4.6 modular or the 5.0, good braking w/ mustang upgrades. Tons of used/new parts available.
The not so good: Big, HEAVY, full size grandma car. $800 set of tires last 2 races(unless Inde--then only 1), 16 gal OE fuel tank of which only 10 gal are usable, ie short stints.
So unless we put in a fuel cell to get longer stints we will never be competitive in class B. All that said, I really like driving the #19 car. We finish 93.3% of the races we start and to finish is to win.
#45 '08 Subaru WRX,
#4 '63 Studebaker Avanti, IOE, The Ridge 2016
#19 '90 Thunderbird Super Coupe(retired) Organizers Choice Award, Sears 2015