what plugs should go in a 1941 plymouth flat 6

Looked up some and said autolite 285 will work. My car has autolite 85 which the center of the plug is a little longer..which would create a hotter plug putting it closer to the piston? Is this a plug I should still run or change it..it runs fine now..just doing a tune up since I can..

 

Spark. Just having fun. Don't get upset.

 

Like the old saying.....better to be a smart a$$ than a dumb a$$...