Patrick James at
www.Pro-system.com setup the Holley DP going on my 408.
I haven't run it yet, buy I know many people using his carbs including some of the top racers around.
He's got a solid reputation for building carbs that make power.

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'89 LX 408...SCAT, Probe, AFR 205, Vic Jr, Pro-Systems, Rawls sft cam, UPR K & arms w/coil overs.....more to come!