New combo looking for some input.

Demons can be hit or miss. They are a very good carb - but there were a LOT of production issues with crap in them from the factory, and I've found issues within the billet metering blocks where they had left "tabs" when some of the tiny holes were drilled and the carbs were permanently lean until you wen tthrough and finished deburring all the holes. Personally I don;t use them because you can get a good one, or a bad one, and unless you start taking it all apart you don't know. A holley you know it needs a power valve and jets and it's good.