The Ford three-speed is refered to as the "Dearborn" transmission in Pontiacs.
The "Nash", if truly a Nash, is a crash-box with no synchronizers ("slick shifted", not really well suited to street). If it has synchros, it's the Richmond. Tough stuff. If it has synchros, and is shifting roughly, either the clutch or shifter are responsible unless it's worn out.
The World Class T-5 (Mustang) is okay for the smaller engines, but the 428 will eat one up in a hurry if you pound on it. Not designed for 450-plus lb. ft. IMO.
Jim
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