Aluminum Intake Heat Crossover

I'm thinking about filling the heat cross over on an intake that has failed repair welds previously. No way it will be re-repaired. I cannot tell if there are cracks extending into the plenum or runners. Just trying to salvage this as a get me by with a manual choke carb.
Anyone here done such as this this before?
If so what were your results?
What did ya' use for fill?