It may just have old gas from sitting so much and some varnish in the bowl and jets. Sounds like it was a garage queen if that is actual mileage. The first thing I would do is drain the tank and fill with fresh gas and then take it on a long drive. I would also run it in the dark and look for any arcing in the wiring. Beautiful car, I had a couple of MGAs and loved them. My 1961 even still had the hand crank for the engine. Yes, 1961!!!