It depends. The basic chassis may be built pretty symetrically since Nascar imposes rules on how much offset and bias can be built into the chassis. Changing control arms and spring rates to balance the car out for right and left turns should be a simple bolt on effort if the car is a symetrical design. Actually a Nationwide or Late Model series car may also be an alternativesince they are built on slightly shorter wheelbases to different requirement levels.
For that matter, you could probably have Racefab, Alston, BMR, Howe or any other supplier put one together specifically for your requirements. Heck, Howe even offers a TA2, GTA, and GT2 chassis package if you are so inclined:
http://www.howeracing.com/Adobe/HoweTA20811.pdf with a base price tag of $72.5k for an LS3. Since they will do any engine and body combo, all it takes is some more money for a change to a Hemi and a Challenger body and you should come in around the same price tag as the Mustang listed above. In the oval track chassis, they do offer symetrical or offset chassis builds in various stages of completion. Prices start at $2700 and go up from there.
http://www.howeracing.com/p-7331-perimeter.aspxIf you really want to keep it mopar based and do it all yourself, there are enough reproduction parts out there that you can buy all the core pieces from an E body to reproduce the old Mopar Kit car program chassis for around $3500 and then add all the associated tubing for the cage and other structure for a few hundred more. After that, you can skin it in darn near any body you want. Run t-bars and leafs, XV L2, AlterK, or whatever suspension suits your fancy.
