Stalling when put in gear ??

The engine is a 318 rebuilt by former owner, has new summit intake, new dual feed Summit carb, size?, looks like a 750 but not sure any way the car starts great idles good, has a lope, in park it can be reved up with no problems but as soon as I put it in gear it stumbles and dies, 904 tranny. Any help would be greatly appreciated.
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