I will just throw us in the mix as well

. We build our Fast-Track chassis for C1,C2 and the 68-72 C3's. It is available with either a traditional four-bar set up and Ford 9" or with our Fast-Track IRS. You can find some additional info here
http://www.roadstershop.com/products...rvette-chassis. Feel free to contact us anytime if you have any questions at all.