I looked up some more detailed info on the carb and it has a 21 metering plate and that works out to a 75 jet for the secondary. Additionally, the power valve is 65 and that is very close to what I would get if I were to follow Holley's instructions for sizing a power valve (halve the idle vacuum then multiply by 10). A 55 would be close too but am I that far off with the 65 to cause this issue?