Thanks for the encouragement guys. Here's a quick update.
I'm using the 2x4 manifold from the Thunderbolt kit (I bought several partial kits of different cars), and as you probably know the stock FE manifolds don't straight up fit the cammer engine.
As you can see below, I modified it at bit, moving the distributor in a bit to line up with the cut-out in the front cover, and moving the water outlet to the top of the manifold.
I also finished deepening the oil pan. I wound up cutting it a bit from my original mock-up.
Additionally, because the battery in the kit was molded into the fenderwell I had to remove it surgically, which required me to rebuild the inner fender to something that resembled stock. I added a piece of styrene that allowed me to add an indentation where the stock battery would go.
Thanks for looking.