I’ll go ahead and assume you’re not motorhomeless…. Because Id feel bad for ya but hate when you’re **bleep**ting on the parking lot down the road from my house behind your broke down Moho.
And a normal person wouldn’t “buy” a rag tag broke down motorhome with the engine partially disassembled when they know nothing about engines. How’d you tow it “home?”
You need to find tdc on the engine and then install the distributor correctly on 1 or 6 if you’re using 1 for tdc. And then learn how to time it.
Find some detailed instructions somewhere and good luck.
And maybe disconnect your exhaust first so you don’t explode it when you get the timing or firing order wrong a few times.