I guess the 1st question would be why even bother.....
On that note I had a 82 HO 5.0L Capri which had a 2 bar carb. It was aluminium with a slightly higher then normal rise to it. The only place you can get that now is inthe boneyards by looking for 82 Mustang GTs and Capri RS 5.0.
If you are circle track racing and are restricted to a 2 barrel carb, maybe a single plane aftermarket 4 barell manifold and a flat adapter plate work work.