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I have a return style regulator that is DOWNSTREAM of the carb and does not kill any of the flow going to the Carb. It is a BACKPRESSURE Regulator and may work for you.

That is exactly how I did mine and used a comp 140 with -08 pressure and return and I have no issues running 10.00@131.00

Light travels faster than the speed of sound,,,this is why some people seem bright untill you hear them speak.