Short of a max-wedge head a 915 should be the best one for your deal. Run right up to the 477 limit with a 7.1 rod. Run a real tight quench and flat top piston then mill the heads to get as much compression as you can and run e-85. If you have to run a flat tappet look at the Comp XE HL lobes and some 1.7 rockers. Get a real good quality lifter and not a rhodes as they will still be colapsing at higher RPM with the spring preasure the mopar rate cam and 1.7 lifters. A SS type lifter desighned with the C-clip in the top and lash set to zero or mabey .005 lash should be able to keep the valves under control and do a good imitation of a solid.

Comp cam to think about
http://www.compcams.com/Company/CC/cam-specs/Details.aspx?csid=632&sb=2