B&M Converter is bad

There is nothing wrong with the converter. 2000 is good for a stock motor in a truck for puling a trailer. When you buy a converter always get a 3500 for the street.

A small block will brake stall a 3500 converter a@ 2800 which is perfect. Its what the 340's came with. I have two I kept for this reason.

With a 70 340 and a 474 purple shaft cam. A factory converter brake stalls @ 3000. Put the same converter in a big block and it brake stalls @ 3500.. Add 300-400 for flash stall.

I run a 5500 ATI on the street. It is what the cam shaft called for. Why build a motor and pick a cam you don't have the converter for.

The advance will also stall the engine when you put it in gear with a bigger cam. Disconnect the vacuum close up the mecanical travel to 20 Degrees. Set the initial at 15 this will put the total at 35. It won't stall then. But it still won't run well with that low stall converter.