Have you been referring to a factory exploded parts diagram for your fuel plumbing issues? Check out this website: epc.brp.com. You will want to look for a 1983 90 hp parts diagram. Specifically the fuel pump and intake manifold pages. You can also substitute a 1972 125 hp fuel pump. The 83 pump mounts to the side of the block. If you don't have the pulse hole in the block, you can purchase a 3-port 125 pump and plumb the pulse line to the old VRO hose from your prior pump. These are the current (superceded) part numbers for: 1983 pump: 438556 1972 pump: 438559