Leaking frost plugs

Picked up 65 Dart with 318 that had been parked for about a year. Runs good and is now parked for winter, a couple of frost plugs are leaking a little wondering is there is a additive I can add next spring like bars leak or something stronger that would do the trick. Don't really feel like pulling motor (not yet) It's not real bad but annoying at this point. Thanks for any input!