What do you mean by "final approach?" FAF to the threshold? No way I'm that slow. Runway made and getting ready to cross the fence? 1.3 is fine in most situations, unless it is particularly gusty. Grummans float as much as Mooneys do, so speed discipline is important - it is also pretty hard to land one smoothly when it has truly quit flying, so you'll often have some sort of speed to burn when the wheels touch - not like a Bonanza. Your power is out, so blue line shouldn't be an issue.