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The move to a 50cc pump, a brown cam and the squirters at 35 and 37 seems extreme. How did the carb perform on the motor before? If you were to put the car with the proposed accelerator pump mods on a chassis dyno and an A/F sniffer up your exhaust you would more than likely see not only black smoke out the exhaust until the accelerator pump and cam has run its course, but the A/F ratio would dip way down into the 9 or 10:1 ratio, affecting your HP for several thousand rpms. I know this because I went through a string of carb mods while on a chassis dyno with my 850 Holley on my 418 stroker. I wound up settling with pink cams on both pri and sec side and 25 squirter on the front and 28's on the back with #73 jets on both pri and sec. I know our two motors aren't very close to the same but just keep this in mind while sorting out your new carb. Your power valve seems to be in the ballpark, but will depend on what vacuum you are drawing at idle.