Your last picture is of the lower part of the intake system I use, but my top has a Z28 two port throttle body bolted to the side of the stock cover, not the stock Rover throttle body that is cast in. Second pic of yours is a custom top for the lower you posted, in a drag car someplace over there, like the U.K. SDI isn't a bad deal for an EFI computer. I use the Ford sequential system because they are easy to find and I have a friend whom tweaks then for me. E/mail me off the board for info on real HEI for points distributors, please. I'm in the process now of doing the design drawings for a new timing cover that has an outside removable oil pump, body and all.
