340 cam selection

Sounds like enough of a ripper that I'd call and check availability and lead time on this piece.
Howards Cams, Mechanical Flat Tappet Camshaft, Chrysler SB LA, 250/256 @ .050, .525/.535, 106 LS - Competition Products
With 285/291@.050 and a 106 LSA for 76 degrees of overlap, it would be plenty rowdy to pull "ALL the RPM's." The 102 ICL would help maintain decent low rpm cylinder pressure, but that's not going to be too much concern with the 4.30 gears.