5.7 HEMI Vs. 408 Stroker

Yes it's a hydr cam - I forget the specs, but I think it's PS 474/474 (P#312-P4452993 on JEGS), if that rings any bells. From what I hear Crane or Comp seem like the cams to go with nowaday. What needs changing to use a roller cam with the old J heads? I know there's much info here about that, but is there a Q&D ans on that?