Upgraded 360 Cam?

Do a compression check first and lets see what you have. Also, see if the engine has stock exhaust valve rotators. There may be a lot more needing done than just a cam swap. But this profile would give you what you want with a gain in low end torque and the stock converter.
Howards Cams, Hydraulic Flat Tappet Camshaft & Lifter Set, Chrysler SB, 215/215 @ .050, .455/.455, 112 LS - Competition Products
Notice that it's in stock and also comes with new lifters. So far, I've been reading only positive reviews of the Howards cam and lifter sets on break in. Also, what year and how many miles does the engine have on it? It may be time for a new set of rocker arms, most of the time the stock rockers are ovaled out where they ride on the rocker shafts. And it's also a good time to install fresh springs (901 series are compatible) and seals, but there are usually complications with locks and retainers if eliminating exhaust rotators unless you're having the heads rebuilt anyway.