Be cautious of using "plenty of gasket sealer" as sometimes too much can make a gasket slippery enough to get out of place.
I have good luck with gasket or weatherstrip adhesive to fix the gasket to the pan and then use a small amount of Permatex #2 on the other side.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-