I just spoke with Tim Banning of For Hemis Only. He makes the baseplate for the Stage V with dual Eddy carbs. He also makes a Six Pack lid and has an offset stud for the rear carb that makes everything line up. You can buy everything from him.

I thought the Six Pack and Hemi lids were the same, but I guess they're different. If you have an original Hemi lid, or buy a reproduction Hemi lid (also available from www.forhemisonly.com), Tim has a guy who makes an adapter for the carb studs that works with the Hemi lid. The price for that pieces isn't too hateful considering it's a "Hemi" part.