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Hey gang. I haven't had much time for road testing the 40mm venturis yet (let alone stacks). Still not driveable, so at present, the forecast is testing via 38mm venturis tomorrow unless I pull off a good tune tonight. I have main jets up to 245 now (!) and with 6 sets of emulsion tubes one would think a solid setup is within grasp. Attached is my tentative dyno flow chart: May 2018 Dyno R&D FlowChart.pdf It assumes unlimited time. I don't yet know if I'll be running 38mm venturis or 40mm venturis or both. At some point I will abandon broad data collection and proceed toward focused data collection. The results will navigate this flowchart, and so will the limited timeline. If half of those boxes have data at the end of the day I'd say that's a win. Any advice or thoughts here is always welcome. Ryan - The electromotive hall effect upgrade instructions are attached. The XDI 200 ($895) would meet/exceed my needs for carburetors, but if I'm going to rewire my ignition... I might as well rewire everything under the hood and integrate all of my fan controllers, etc. into one computer: the GT200 ($1,695!), which would also be forward-compatible with sequential fuel injection one day (should ITBs ever occur on the car). That's an $1,700 upgrade for a TPS at present. For now I'll save my cash and I'm buying the Electromotive loaner XDI unit from them, so I can get out there and race! I may have built a race motor (RIP, RIP...), but I'm a driver first and a builder/owner second. I'm already late to race season as it is!