75hp Powerpack ?

[WVUmtneers]

I have a 1976 75hp 4 cylinder thats needs a new power pack. I recently bought a used power pack via ebay with matching part number (581713). The problem is the power pack I got is from a 70hp 3 cylinder and has a different cover plate/wiring diagram. Will this part still work?

[boats.net]

No it wont work.