The "O" rings work well enough, and if the ones you have are original they should be retired.
The potential for damaging the the teeth of the quadrant and the cam plate is high, beware. When you apply torque to the quadrant bolt it can be supported, to some degree by holding the shifter. When you apply torque to the cam plate bolt the force bears on the teeth linking the quadrant and the cam plate. I know this when making mistake 2078 and broke a tooth on the cam plate gear many years ago; I think I'm up to mistake 3865 by now.
I'd advise you to live with the weep(s) until you are ready to overhaul the g/b, at which time proper oil seals can be installed. I'm still a believer on the "O" rings, and if you choose to go that way you can enhance their service life by selecting polished washers with the smooth side up against the "O" ring; you can also polish what you have.
when you go to reinstall the two pieces the quadrant goes in first and can be supported or held to take the proper torque. When you go to reinstall the cam plate use a large pin wrench fitted securely to the cam plate, do not try and pass torque using the quadrant at any stage.
Also, be sure to install the sleeve gear before the cam plate/quadrant, or you'll get a second lesson...
Best.