I think there WERE carb intakes made...and quite possibly for the magnum headed engines. Mopar Performance issued some 3.9 v6 crate engines iirc, and they used a dual plane mopar intake for carbs...iirc, not many were made so tracking them down is near impossible.
they may have been for the LA style heads too, so redrilling/tapping for LA style bolt pattern is a possibility too.
1979 Dodge Lil' Red Express - 360 rwhp, 13.2 @ 103mph
1968 Coronet: 318, 2.76, 15.2 @ 92mph! (SOLD)
1976 Valiant: 360, 3.90, 12.90 @ 106 (SOLD)
1989 Shelby CSX #500/500
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