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If you're having overheating problems at med to higher speed, it's likely a flow issue. the last Superstat I bought only had a 1" diameter opening. The EMP/Robetshaw ones are 1 7/16" diameter opening. They're worth it.
https://www.summitracing.com/parts/emp-301
From the factory there is no bushing at the shaft through the throttle plate. Excessively strong return springs can cause wear here, same as just regular age. Some Holley kits have spiral cut teflon sleeves for worn shafts. But the wear is never a true circle.
I don't know other than the little teflon curly-Q things in the Holley kits. If I had that issue, I'd just send them to Woodruff or someone similar that has the jigs and tools for throttle shafts. Staked screws require attention to detail.