Comp XE268H v Crow 18619 - 318

Thanks all. From the comments I have come up with below.
I like the idea of a roller cam but haven't had one retro fit before.

Howards retro fit hydraulic roller.
Hydraulic Roller Big Mama Rattler Camshaft; 1964 - 2003 Chrysler 273, 340, 360 2000 to 5700 Howards Cams 718045-09 | Howards Cams

Isky mega 270 with 1.6 rockers
Mega-Cams™ [390171] - $208.00 : ISKY Racing Cams, Do It Right

Howards HRC711451-08
Howards, Hydraulic Flat Tappet Camshaft, Chrysler SB 273-360, 220/220 @ .050, .506/.506, 108 LS-Competition Products