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#523 also has a Holley Red Top, which I believe is their standard fitment. It has a built in regulator, so it doesn't need a separate one. There will probably be an inline filter just in front of the pump, which is mounted on the main chassis tube just to the right of the diff. Disconnect and remove the filter and clean it out. It will be obvious if it is blocked with debris.
Are you also using a mechanical pump on the engine?
Paul
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