anyone know a good Mustang forum?

reliability? get a pertronix or electronic ignition---- rebuild the carb or send it to a good quality shop-- that car will be dependable.
upgrade the brakes & that car is as good as most newer cars.

I had a slant 6 62 valiant -- started every day whether 100 + or -20 F-- sat outside, in the cold it started better than the fi vehicles I own.
save your fi $$ & upgrade the stereo & window seals. Or as been suggested trade for a mopar of like vintage & move on.
Lawrence