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The only sensible way to convert it to carb is to get a complete setup (manifold, carb, etc.) form a Canadian or Euro car. The end result may run OK but will not be emissions legal anywhere in the USA though.
There are kits to put a Ford 5.0 in it. Apparently this fits a lot better than a Chevy. If you really want to go with GM, the Buick/Range Rover aluminum V8 is the best choice.
You mentioned stalling. Does it stall out at random, then restart after a few seconds and run normally, until the next time, which can be anywhere from a few minutes to a few weeks later?
Mine did this. It was the radio interference suppressor relay. Don't screw around with resoldering. Just buy a new one. They are less than $50.
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