Yes, you need the stock filter wth the dual outlet. It's like a presure relief valve for the fuel pump. If the pump is sending too much fuel to the carb, the float valve will stop the flow of fuel into the bowl. If that return line isn't there, the fuel has no where to go. This could possibly rupture the diaphragm in the fuel pump...depending on the quality of the pump. If that ruptures, you have a direct fuel leak into the crankcase. And that is BAD.
This situation is even worse with the Weber, or most aftermarket carbs. The Weber needs about 3-4 psi (if memory serves) and the stock pump puts out about 7-8 psi. Many here (including me and my Holley) have found that running a fuel pressure regulator allows beter tuning. And you would need the dual outlet filter even more if you were to put the regulator in.
Handicapped license plates are not for mentally handicapped people -
"Man has not yet evolved an inch from the primordial slime that spawned him." Mark Blankfield, Jekyll & Hyde... Together again
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