Cliff can correct me if this is wrong but I believe the feed system he is referring to is the bottom fill that uses the inlet check ball to seal the feed when the pump pushes on the fuel. There is also a fill slot that will fill the pump area from the side/top but you must use the proper type of pump for that to work. In order to fill from the side/top only, you need a pump with a "floating cup". This allows the fuel to fill over the top when the pump is at rest, Most of this design does not use a garter spring in the cup. Works much like a master cylinder as far as how it fills. My guess is that the fill area at the bottom of the well gets corroded and leaks after 40 years of use, and that is Cliff's concern. To block that feed and eliminate the possible leak, I think you could lightly tap an extra outlet check ball in the inlet. It is larger and would block that passage. I have seen that done and always wondered why it was blocked, now I know. The system works fine with that blocked and a proper pump. As Cliff said, opening the cluster just delivers the same shot faster. That may give you bog, stumble if the pump shot runs out before the main system and power system are flowing enough fuel. I would concentrate on a larger pump shot, with Cliff's shorter pump and possibly a slightly higher float level to richen all the circuits a little.
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