The exhaust manifold is not difficult to replace if you have room to access it. Remove the carb. and exhaust flange and the three bolts that hold the manifold. If it worked, JB weld would only be a short term fix. Besides, if there is a hole corroded through the manifold, there is likely a lot more corrosion you just haven't seen yet.
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Pearson 10M
Gloucester, Va
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