We splashed Thursday, and took the boat today. Had a little trouble starting her (batteries were lower than I expected), but eventually she started. Everything ran great! The packing gland dripped like it was supposed to. Maybe a bit too much, but not incredibly so, and I'll deal with that. I reached in over the engine at one point and although the engine was still hot, the stuffing box wasn't. So, I take that as a good sign.
Thanks everyone for your help and encouragement!