How hard will it be to install an after market AC on a 240Z. I am looking at getting a 240z and have found a few with out AC, I live in Mississippi and need AC. Any help would be great

If you get a kit such as the one that MSA sells, it will give you everything you need to install the A/C. It will more than likely be at least a weekend project. The hardest part will be installing the all the under dash components, you may have to remove the heater unit to add on the A/C and related ducting. All the parts under the hood will be easy, it's inside that will be the most work. I haven't tried it, so cannot give you any definate answers to how long or how much labor is involved.