Bob pump shoe

So I’m replacing the pump shoe in a Bob gen2 with a Worx pump shoe. When I install the pump shoe and screw in to the original holes it doesn’t line up correctly vertically and has a lip from the pump shoe to the top of the pump. Will this cause cavitation? Do I just grind out the whole thing so there’s an even lip? Shim the shoe up and drill new holes? Anyone else have this problem?
 

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