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I may not be the best person to help, as I'm very new to MG ownership, but I
think I may have an insight.....the engine in my 58 Magnette is #
BP15HCG-4987.   So, I think it may be a  sedan engine that someone swapped in
at some point. 
BTW, the Magnette has a hose running from the valve cover pipe to the air
cleaner assembly(common air cleaner for both carbs.), and doesn't have a
tachometer, so no tach drive!
Hope this helps...................         Jon Arzt
58 Magnette 
66 Sunbeam Alpine
67 Sunbeam caravan
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