318 combo

That's sort of what I was thinking. How about this Comp Cam - 212/218@50, 447/455 lift.

http://www.summitracing.com/parts/cca-cl20-221-3/overview/make/chrysler

or Lunati 216/216@50, 454/454 lift.

http://www.summitracing.com/parts/lun-80360lk/overview/make/chrysler