Need help with Edelbrock DP4B inatake from 1970's for 383 - the stock throttle brackets don't line up with the mounting hole in manifold, what does a finished bracket end up looking like? Did Edelbrock supply throttle brackets that did fit and require no mods to work?

Also - what is the hole in the top of the manifold for, the hole just below the water/nitroous injection threaded port, it leads a channel that flows out the bottom of the manifold. Some DP4B's didn't have this hole/channel cast into them. Thanks men!