Rich idle, would this help?

Mad Dart/Cannucky-I read the links. The problems and fixes seem like what I need but they are using the billet metering blocks. In the original post on YellowBullet the OP talks about going back to the "old style" metering block, like mine. Mine are cast and I don't see how it could be modded as recommended in the links. MD, are you doing these mods to a HP or standard DP?