I think a front undertray would be fairly easy to form if you bolted it to the front crossmember and maybe attached it to the front valence somehow. I think they still make a "Special Tuning" front valence for the MG that works to divert air from the area directly under the engine, which I think is the most aerodynamically dirty area. It might help to invest in a heavy duty oil cooler, which might help to reduce the temperatures in the engine bay, although in my experience, getting the radiator cleaned out helps drop the temperature pretty well (and radiator shops do it pretty cheap). Flat disk wheel covers would look awesome on the MG, and also help with the aerodynamics a bit.
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