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I am a little surprised a 6" lift would be a problem for your pump but a few things come to mind. Reducing the restriction to the pump inlet is a function of lowering the pump or increasing the tube diameter. If inlet is now #6 or 3/8 increase to #10 or even #12 AN. The catch may be ability to increase the tank or bulkhead fitting but this has to be easier and less $$ than building a bottom sump.
I have had to use a pick up tank like mentioned by rick427. I plumbed inlet and return into the pick up tank on the top. The first pump (rated for continuous run) was used to fill a 2qt tank that simply kept it full. A line or fitting on the top of this tank dumped back into main tank only if tank was full. The 2nd or main fuel pump picked up fuel from this tank. The 2nd fuel pump was a demand type pump (turned on and off) as needed to maintain a fixed pressure to the carbs. A continuous type with a return could be used with additional bung or return to main tank.
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