[runningbear55]

I agree completely, the big block and L79 intakes moved away from the 3 hole carb flange around the same time. I don't think your two cents was worthless...thanks for the support. I am going to try and find that old GM press photo of the early Z28 engine components all laid out...because that is where I saw this intake as a teen in the early 80's. The search continues...and the mystery remains unsolved. Ken