Thanks Bosswrench. The water pump is the Flowkooler 1648 mentioned in George's cooling system analysis sticky thread and by others so I believe it to be correct non-serpentine model:
and the Permatex is this one in the pic.
Summit sent the wrong bolt kit with the pump (for a Chevy with only 4 same length bolts) and are now sending the correct kit with 11 different length bolts.
I had a chance to talk with Tara at Hall Pantera today and they will be back in the shop on the 2nd if anyone is interested, and I also got a nice call back from Dennis Quella. If I change my mind and go aluminum I'll be ordering directly from him. I am hoping to follow up with Brassworks when they reopen to find out more info about their radiator which there is a link to elsewhere but I'll put here again for general purposes:
I'm not sure what:
"Its made with tellurium copper and highly elliptical staggerred tube design and serves as the mid engines primary heat exchanger."
means, but I intend to find out.