Between A, B, and E bodies, I can see advantages and disadvantages that each one might have but it's unclear which set of attributes comes out with the best formula.
Regarding stock or stock-ish classic Mopars, I'd look to the B-Body ('68-'70 in particular) as probably has the best mix. It has the better (stiffer?) chassis than the A-Body and generally more room for tires, heavier duty OEM equipment and the stability from the longer wheelbase which seems to be a big help in many road course situations while giving up no real weight advantage (if any) to the stockier otherwise similarly massive, similarly equipped E-bodies.
Assuming that we're sticking with a stock style torsion bar front end/leaf spring rear, and building an otherwise optimized protouring car, I'd suspect a toss-up between the 108" A-body coupes and the 111" Darts, beating out the B-Bodies thanks to being significantly lighter while having essentially the same suspension. The Duster/Demon/Sport coupes have quite a bit more room for rear rubber and (IIRC) tend to be a bit lighter...but again, the longer wheelbase tends to be a boon to stability.
What do you guys think? Any thoughts (and corrections to my assumptions) are very welcome.
Just depends what you are trying to accomplish. The A body cars are smaller and lighter. With a late model Hemi install they would be very potent. But they might be a little on the small side if you want something to actually drive in. Especially if you're planning on having a buddy or a wife or someone with you and maybe take some luggage along.
If you're going to build a Pro Touring car that actually gets out on the highway and goes somewhere then I'd step up to a B body car. If you want a real challenge then go with an early B body car. My '65 Coronet isn't a lot bigger than my Duster but a big block drops right in and there is a little more space inside the car and in the trunk.
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