Retro Roller Info
I'm sure this is probably too late but, You can use your rear cam plugs position to align the cam gear or do what I do and make a spacer the same specs as the front retainer plate minus mounting lugs. (You must use a cam button that has been machined down to fit the roller cam gear)and Allen Head screws for mounting cam. Hex Heads are too large and will hit the button. Liquid threadlock on screw threads.
O.D.=2.75, I.D.=1.568 +or-.002, Thickness=.136 +or-.002,
You also need 4 Oil Groove slots from OD to ID on front face .0625=1/16" deep.