I'm no expert, but for a flywheel I would think this steel one from McLeod would work:
464108 CHRYSLER 2002-2006 V8 348 ; HEMI, 8 Blt Crnk, 130T R/G, Patt: 4,6
They sell an aluminum one as well.
Then you need a clutch for the 18 spline.
Travis
72 Cuda