Been there, done that. Too much duration & overlap, not enough lift. Put one in a .030 over balanced/printed 383 RR, 3.23s & stock converter. Sounded wicked, but was soft on the bottom and not well-mannered even at 4* advanced. Lots of fun over 3000RPM or so. Terrible gas mileage. I've since been very happy with Engle's stuff, which takes advantage of the Chrysler lifter size. Especially with AC, I'd go somewhere around their 214/224 @ .050, .470/.504 lift split-pattern hydraulic. Had that spec cam in a 406" Duster with AC; good vauum, throttle response & manners, sounds healthy, 17MPG at 70, happy with a 3.21 gear and stock converter. The MP 284/484 is old tech; still popular, but better stuff is available.