I would go a step further and replace all the small parts if still available. There must be a reason the owner got disgusted with the shoe brake. The little parts are cheaply made and a little wear,bending and corrosion allows the assembly to bind and drag but not supply any holdinp power. Even resealed and assembled with new parts, the most positive comments you can expect, "better than it was "
Ruben
Also make sure you drain the transmission first if you change the seal and little o-ring.....another fun job....
also make sure the arm on the parking brake backing plate which moves the shoe is turned so the nut and bolt that hold the arm in place are pointed down otherwise if pointed up they hit the case of the ransmission not getting full throw. seems like they always come the wrong way. always good to double seal them as well kind of a cheap seal.
That uses a drum and shoes on a shaft that comes out of the transmission. You will have to go underneath and install the backing plate and shoe assembly, and drum. Hook up the cable and run it up to along side the seat. Install the lever next to the seat. It really shouldn't take too long (2 hours) but add on time for Murphy's Law and that would double that time.