Matthew,
based on how close the ‘rib’ of your booster is to the hump in the center of the firewall, I’m going to hazard a guess that the truck wasn’t originally designed for rod linkage at all. Run a few image searches for other non-US firewalls and see what you come up with. Come to think of it, somebody else did post recently with a jacked up carb that had a firewall that looked like it had no provision for rod linkage.
As for the lug nuts, you’re fine with what you have. I had to install longer lug studs on my 45 because of aftermarket wheels. Then I got a set of stock wheels from
@HKforte and had to run capped chrome lug nuts to keep my goofy long studs covered from the elements.