How can i run my Johnson 28SPL outboard motor without it being in the water safely it is a 1991 but does not have the usual water filteres on each side so the earmuff type doesn't work?

I use a 30 gallon plastic drum and a sawhorse. If it's mounted on your transom, you can use a plastic barrel...

put the barrel on a high spot (like your porch) with the lower

end of the engine in it, fill with water to the correct level,

(above the cavitation plate) and be careful about running it

in gear (Prop can hit the barrel, and thrust can move the barrel).