Only MPC, AMT and Aurora made HUG kits, and the Aurora kit is in 1/32nd scale.
From what I have heard, the kit was supposed to really be the Plymouth Dealers Barracuda that was driven by Tom "The Mongoose" McEwen, but, for some reason, it was not done and turned into the HUG car.
As you can see, it is really close to the kit, with the exception being that it is a '65 and the kit is a '66. The car was later driven by Fred Goeske, who took over after McEwen crashed the car in a freak accident.
As you can see, the HUG has a stock front end and the engine sits farther back, as where the PD car has the layout we see in the kit. Engine right behind the driver and separated by the large firewall.
The PD car was supercharged and the HUG was injected.
So yes, you can use this kit to build either car with some mods and a donor body!