If you were looking for a GNX one, that may have been part of the problem. GNX was the last year ('87) of the 'black' cars, and the g-body in general. The ones that got the draw thru carb plenum were 1978-82.
I was looking for any kind of "GN" intake, but there was no way to search what that piece where the carb bolts to is called - therfor couldn't locate one. But alas, it's all good - and I figured it out blow-thru instead.