You might want to check out AussieSpeed and their 4 bbl intakes. They have 9 different intakess 2 bbl, 4 bbl, 2-4 bbl with long and short runners. A bit pricey, but they work well. I have a long runner with a 390 cfm Holley that I ran for two years on a 73 Mordor.
To take full advantage...