Think Howards( who does all the Hughes stuff) has a 259/267 roller.
Might try them and see if they have it, or someone else does
Howards Cams, Steel Billet Mechanical Roller Camshaft, Chrysler SB LA 273-360/318, 259/267 @.050, .640/.645, 106 LS - Competition Products
Howards Camshaft...