No room for new throttle shaft bushing

I have a junkyard Carter BBD that came with a Super Six setup I plan to install on my Dart. The throttle shaft has a bit of play, so I bought a kit to install a brass bushing. The problem is the hole in the throttle body is offset so there's not enough aluminum on one side (see picture). Can I build up that side by brazing aluminum onto it? Any tips on how to do it right? I've never brazed aluminum before but according to YouTube all you do is clean thoroughly, heat the piece really hot and then touch the brazing rod to it. I have a propane torch and the brazing rods are $5 at Amazon or Home Depot.

The shaft is 5/16" and the bushing has a 3/8" outer diameter. https://www.ebay.com/itm/5-16-Throt...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649
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