eBay
Here's a GM manual transmission cast iron bell housing. GM #3925505. Some rust, but nothing too severe, should clean up nice. It has the large opening meant for truck transmissions (with the larger main bearing retainer) but can be used with car transmissions with an adapter ring now being sold. Item sold as is. Its a heavy item and the shipping cost reflects that, however If the shipping cost ends up being less, I will gladly refund the difference,

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