If you haven’t ordered the cam yet, you may want to check with Competition Products first. I bought the same cam from them for about $50 less than Summit. I think they are a sister company of Howards.
Howards Cams, Steel Billet Mechanical Roller Camshaft, Chrysler SB LA 273-360/318, 245/253 @.050, .600/.600, 108 LS - Competition Products