Check the power valve. The jets SHOULD NOT effect on how it idles.If the powervalve is blown,or if it is opening at Idle, it will be 8-10 jet sizes too rich. Also if you have the speed screw turned in far enough to uncover too much of the transfer slot in the base plate,it will pull from the main circuit.
Did you use a new metering block gasket or reuse the old?Is it the correct gasket for that carb? Did you make sure there was no left over gasket stuck to the block?