Here's the intake you'll need
http://www.ocperformanceparts.com/the_1st_single_4bbl_gen_3_hemi_dual_plane

Your basic plan should work just fine. You're only looking for about 500 HP to meet your goals which isn't difficult to make given the good heads and a few cubic inches.

500 hp @ 392 CID is only 1.275 HP/CID. Mine makes 1.65ish with no magic tricks.


-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA