The first thing you will be told by many of us here is to stay away from the dealer thieves! Most of them way over price the cars and most of them wouldn't know the difference between a 1st Generation Camaro and a washing machine. The sad part is that they don't seem to care about respect for the hobby and the love for the American Muscle Car. All they know is that the market is hot right now and they see dollar signs.
Second thing you should do is to read up on the '68, or any 1st Gen, at the CRG.org site. Learn about the cars, the options, and come back here for advice.
'68 rs/SS 350 M-21 posi