I would at least hone out the brake cylinders and put new cups in as they are cheap. I would also check the radiator and heater core for gunk, change the steering gear lube, oil / grease all including window regulators, door hinges, etc.
The double lip seals may work for a while but I bet it won't be too long before you have water in the tranny. Since your changing the tranny fluid might as well replace the seals.
Sounds like a lot of work, better sell it to me.
