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Upper control arm bushings. You can find them at our supporting corvette vendors, most "box" auto parts stores. You can also find how to videos on YouTube.
1980? I think that was the first year for the coffee can vacuum reservoir.
I'm not 100% sure what that bar is, but it should probably be welded at both ends. Here's the least terrible photo I found that sorta shows it. This is looking up from beneath, with the hood raised (visible behind the coffee can).
I STRONGLY suggest that you get the rubber fuel line, and fuel filter, MUCH FURTHER away from the exhaust manifold, than they presently are. They get hot enough, and a-arm bushings won't be a concern....