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The Drag Pack Challengers had an intake with a four barrel bolt pattern - it should be available through Mopar Performance, but I'm not sure of the part number. The biggest drawback is that this intake is VERY tall (probably wouldn't clear a stock A body hood) and designed for engines that rev...

Don't forget the ignition as well.

How about going to the later coil style with no plug wires, and modifying some sort of valve cover from another engine to fit over the coils and valve covers at the same time?

The only new Hemi car I've worked on with a non-factory fuel system used a return type fuel rail and fairly conventional Aeromotive parts.

Reportedly a few Drag Pack Challengers have hit those times with a 6.1, although they're a bit lighter than your target weight.