In also living in the salt belt I'll bet you won't be able to tighten the TB bolt w/flag nut since it's going to be rusted/seized unless you've had it off before. You'll probably have to remove the bolt to clean the rust off of the threads near the shoulder to tighten it so the nut/TB doesn't move anymore. May take a lot of PB to get the bolt/nut loose and sometimes heat.
And don't destroy the bolt by removing it with tension on the TB. I stripped the threads right off this $20 bolt (96 OE #6502554) then couldn't get the new one in w/o the TB lined up. Some guy named Polka taught me to line up the TB by having someone turn the steering wheel with the front tires on the ground and let the body do the work.