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I'd do it for 1/3 that and laugh. The kit can't have gone up that much since last time I done one. Nothing to rebuild a Holley. Find site with some information and do it yourself.
Or just buy the rebuild kit and a bucket of carb cleaner and do it yourself. Trust me if you can follow instructions on how to build legos then you can rebuild a carb.
The kits for a 4150/4160 holley are 22 dollars at advance. They are SIMPLE to rebuild. Contact summit, they sell holley reman. carbs for far less than you were being quoted for a rebuild. Anyone who is charging 400.00+ for a holley rebuild must have a labor rate of approx. 390 dollars per hr. There is no man or woman in the world worth that rate....