It’s the fact that as far as preservation of the car, I don’t really want to put any extra foreign welds or fabrication onto the car. I’m trying to keep an original theme to it which is why I’m looking to use Mopar parts off of other makes and models to try to maintain originality
going to a super six set up won't affect anything in the vein of "preservation of the car". it's all on the motor. BUT you will have to upgrade to a throttle cable and not throttle rod if the car hasn't been done so already.
as RRR said, if you can't find or don't want to pay the $$$ for the brackets/kick down you'll need to have jr high metal shop fab skills, some creativity and a little bit of understanding of how the components work together.
of course you could go with an aftermarket cable bracket/kick down set up, but it will 100% look modern in an otherwise vintage engine bay.
anyway, i'd back the truck up. read and research first before you go upgrading willy-nilly.
also, i'd recommend fixing the starting issue first. that would be a good project to get your feet wet on.