The oem modified intake works well, even with modified carbs but on more or less cookie cutter small block stroker with heads in the 285-295 real world area mine would start to go flat at 6700 or so.

I now have the indy mod man with the big plenum under what amounts to a 1.5 spacer above the plenum and with some adjustments its the one thing the motor really needed, happy at 7k but seems to go alot further if needed.

If you have a stick or a mild vert/gears the mod man is somthing to consider.

Opinions will vary on six packs in as many ways as any mopar topic, its just a different but fun fuel delivery system.