[Steeveedee]

If you already have heat (and the heater core is good), I'd recommend an after-market AC, as it is less invasive than putting in factory air. Note that if you don't have AC already, a larger radiator should be obtained. You'll have to make the cost trade on your own. I put air conditioning in many older vehicles that I owned, by myself. But in those days I was a mechanic with the experience in the field. It may be advantageous to buy a system from Vintage Air or some company like that. It just depends on what you have and want.