Correction, very stubron intake gasket

Just a thought. If you make a plate for the carb perch. If you have a chain hoist? Put a little pressure on the manifold by lifting the engine slightly with that plate. Then take a pry bar with a wide flange on it and exert some pressure on the manifold. If you have a buddy, use two pry bars. I've never done this, but it might be worth a try. (be gentle) Howard