I'm geting ready to add a/c to my 66 with the 5.0 HO carbed and all the serpentine setup. I have the old 5.0 a/c compressor in the serp. setup so that when I am ready to add the a/c, it will have a place to put the compressor with no problem. So what's the best complete unit to purchase and also ease of install as part of the package? Thanks, gary.