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Boost referencing means that the power valve takes it's signal from the manifold below the blower. You have to plug the existing power valve port and drill a new passage to the power valve. This is connected to the manifold via a hose.
Unless you want to take the chance of damaging your carb, it's best left to an experienced carb/blower shop.
Do a seach in the Tech section on boost referencing, these some info from much more experienced people than myself.
Gary
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