I am putting AC in my Cobra. I got a complete kit from
Hot Rod Air for about $850. I don't know how well it works yet, as I am still building, but AC makes a big difference in my convertible Mustang, even with the top down.
If you want a nice stretch wheelbase car that doesn't look funny and has IRS that you can build for under $30K, check out
Hunter Kit Cars .
One of these is a "90 wheelbase and one is a "96 wheelbase - can you tell which is which?
Pete