Increasing the fuel pressure to 14psi (max for a stock pump), will allow it to flow similar to the 350 Police Interceptor injectors, which were "hotter". That spring is the fuel pressure regulator spring. This is the first step to optimizing the TBI, without doing any grinding or machining which will further increase the TBI to a max of 46mm (600cfm) The spacer increases cfms slightly by raising the pods out of the bores. It just isn't disclosing to you that you should already have a cam, headers, full exhaust, cylinder head work. The cars and trucks shared a lot of the same tech, and it all applies. Frankly a lot of this stuff came from that crowd. Follow the 3rd generation F-body crowd around and familiarize yourselves with the inadequate Rochester 220 TBI systems the 305s and 350s were given as a stock platform. Speaking as one of those guys that actually has these things under the hood - in my K1500 and my TransAm - they do help but they are not worth 40HP to a STOCK engine.
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