A lot of this is just speculation as you don't have a complete car yet. If you start with the right Mopar you can get them slightly under class weights, but there isn't going to be much into the car. The Challenger and the Road Runner are cleaned out caged cars, full steel except for their hoods. Aluminium topped motors (heads and intakes) and are pretty stripped down but retain "factory appearing" and still work as cars to be tagged and titled, horns, wipers etc. E-Max: As raced, me in it, 1/2 bag of gas - 3776lbs (That is driving straight from the track to a set of scales.) Road Runner: Last weight for a competition event tech: 3556lbs, Full bag of gas, no driver.
All that said, you want a light car... Our 65 Mustang R&D car I have been driving this year to develop our kit, has an all steel 5.0 Roller out of a 93 Explorer, T-5 from a swapmeet, and a 9" out of an icecream truck. 2 layers of insulation and is a complete car, tunes, heater, wipers. - 3090lbs. no driver 1/2 bag of gas.
