old erson cam specs 1m286y ?

would anyone have an old erson cam spec catalog ? I need to know the specs of this erson cam > This is what is stamped on the end of the cam
1m286y it's a high flow cam for a 273 mopar sb.

I did call erson cams and john gave me a website to look some info up but didn't find what I was searching for . john gave a number of E420-721 .... this number I could not find info on but e410721 had some info . I think he typed the wrong number in . hate to keep bothering him. I need to know what the cam card specs are expecially duration , llft and valve lash .
Thanks guys !
john