SOsavanna

Hey all, have a stock 12a GS from 1984 (actually it may just be an S? How do I tell) anyway my brakes started to fail on my way home from work and I'm pretty sure it's my master cylinder. This winter I wanna do a GSL or SE disc brake swap but I wanna be able to drive it for the rest of the summer and need a new master.

can I use a gsl master cylinder in my drum brake car? I assume it'll just change the brakin input and make it more touchy/stiff.

thanks!