I searched for detailed info and/or tips and couldn't find any so i thought i would post up what I found during the R&R process. First, we all know that thing is hideous and I know the cool kids are putting in Vintage Air however i was on a mission to re-do the AC for stock appearance (at least for now). With that out of the way the problem is how to work on the fiberglass housing, AKA suitcase. Here's the wrenching part... I went to the trouble of removing the inner fender which BTW is not really that difficult and frees up a lot of space. With that out of the way i could see what i was working with. The suitcase is attached to the firewall with a few bolts, you will need to remember that some are a bit hidden in the blower motor area so make sure you get those. There are also studs which protrude from the inner heater core box so make sure you don't bend or mar those during removal. There are also 6 bolts IIRC that hold the two halves together. Logic would tell you when GM/Harrison was designing the box to make the bolts accessible right??? Well the bottom two bolts that hold the two halves together are a nightmare to remove with any kind of exhaust in the car... to take them out you need to access from the block (not the fender) side. I did a mod to this - i used my POR15 epoxy which dries rock hard and filled in the block side and added a little more for some mass and drilled out the fender side. This gave me easy access to put the halves together with the bolts as i had a straight visual shot from the fender side. If you are replacing the Evaporator you will need to unbolt everything and open up the halves from the topside, this barely gives you enough room to R&R the evap - it is very do-able just take your time.