I got some good news from AC Global today. They mentioned they have redesigned the heater core to fit the heater box I mailed to them via @71Polara383 parts stash, and was able to fit it with their evaporator in it. I have asked them to email pics to me to see how well the two boxes seal together.
They have already made the aluminum HC, and are working on making a copper HC to fit as well.
Not sure if it makes any difference, but I've asked them if they can make one in brass too.
This is encouraging news. Hopefully it will help solve one of the many the hard to find "off the shelf" products, for C body owners.
That is great news Tim - great work from you and Wyatt - excellent! I was confident these folks would come through for us and I am glad they did. I really like to promote these folks as well as others such as ABC Moparts, Murray Park, QQE, Centric, Legendary, Spectra Premium and so many others. They really help us all take our cars to much better heights at reasonable costs. Even SMS helps greatly although its not without some patience.