[RichardJ]

I gained 4-5 inches of clearance around the carb by bolting the brake booster directly to the firewall and eliminating that brake rod bell crank linkage.

I think Offy may have suggested that orientation back in the '60s when they offered this bell crank setup that was supposed to connect to the original auto kick down rod and throttle rod.
Your Lokar cable didn't exist for another 20 years after this manifold was first introduced.