I have always used Mothers Chrome Polish with some steel wool. Made the aluminum slots look sort of machined finish but if you keep going can be brought to a high polish.
I'm eagerly awaiting your progress! Just looked at JVX's website and couldn't find the LA to 8sp adapters. Could you tell me what's the part number on that flex plate and any other details about it specifically?
I have no experience with either but here are some other possible options...
https://www.qualitypowerauto.com/item_557/Chrysler-Mount-Mega-Amp-Alternator.htm
https://store.alternatorparts.com/dodge-chrysler-plymouth-jeep.aspx
Look around where you live RRR. You might be able to find a shop the will make any A/C hose you need locally. Even in hot rod hell Tucson we have a shop that does that and they have been lifesavers at times when swapping in parts that weren't OEM.
It's basically a controlled air bleed. So, your carb would need to be set up rich and his system would autocorrect for this rich condition by adding the correct amount of air. At least that's how I understand it.
The one thing I'll state is don't scrap any of it. It's better to give it away than lose a part that will never be made again and could potentially be used by someone.
Trying to find someone to purchse the whole lot is a lot tougher to find than individual buyers that can actually use a...