something in the idle circut must not be right or the secondary throttle plate open to far past the transfer slots,power valve blown could be tons of things...............need more info,im having the same problem but i asked for mine with a dual holley set up............

Double check the baseplate gasket.

Run a straight edge across the surfaces and see if there's any gap.

i put the stock base plate back on with the same gasket and it runs like a champ. guys a summit seen to be thinking its warped too. time to box it up and ship it off