[dwcsr]

You have a choice of several. Vintage Air, Old Air and a few others. I have installed both vintage and old air and prefer Old air.
With an insulated cab both will work very well here in Houston.

Vintage and Old-air are in Texas
Old air lets you use a stock compressor if you already have it. Vintage you have to use their compressor.
Old air is real easy to install. Vintage is a little harder.
Vintage has a little better controls
Old air seems to have a better support team
price is about the same
Neither has fresh air feed so fogging may some times be an issue here.
Both have brackets for just about any engine but if your going to use an LS engine I suggest using the Holley brackets. Much nicer and about the same cost as vintages brackets.
Instructions on Old air are better. Vintage needs to update theirs but don't seem to care about that. Neither are great instructions

They both have the evaporator and heater core in the same case so you must keep 50/50 antifreeze in the engine or you will bust the core.