The Mg handles and stops very well. The issue is that you need about 100 real Hp at the wheels. The stocker makes about 75 @ the wheels. I am pretty sure that the 32/36 Weber carb is legal for the car. The area is less than the dual Strombergs but often goes faster/ easier/ more often.
The poor engine needs to spin around 6000 RPM to do those numbers and the cam/ rods/ crank are not happy there. Put iin a letter for the move to ITC and race the car in vintage/ Chump etc. (If you already have the car.) IMHO.
MM