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Figured I would update this. I gave up on the used carb and I ended up getting a refurbished 600 from Holley and the engine ran a lot better right away. I picked up 1000 rpm's from 5000 max to 6000 now. Turns out the check ball for the secondaries was jammed in place and not allowing them to open at all. I did a little more tuning and I'm currently running 76 primary jets and the purple spring for the secondaries. The boat almost jumps out of the water when you floor it from idle and it feels like the top speed is in the 70-75 mph range.
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69 Z28 JL8 4 wheel disc brakes - being restored
09 Silverado Z71
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