Circling back around on this - no need to apologize! Its all great information and totally applicable.
I finally got a chance to get everything set and am getting close to dropping the engine in and firing.
I test-fit my Yukon radiator and it fits like its made for it. I need to drill the holes for the grommets at the bottom of the radiator and this radiator is original (so from 2006) so I decided to use this one for mock up and order a new one.
Also need to grab some angle iron and sheet metal to build the top mount but thats simple enough and can wait a little bit.