That first post I shared for a cam plays well with the stock converter. This is another choice that is very similar to the comp 268 high energy we installed in the low compression 360. It would work well for more mid power in your truck. Howards Cams, Hydraulic Flat Tappet Camshaft & Lifter Set, Chrysler SB, 215/215 @ .050, .455/.455, 112 LS-Competition Products
But if you’re able to find a custom grinder with cores in stock, that is the better way to go. Don at FBO would definitely get you into something that would be much better than all the options I listed.