Cam Button how to.....next question: how to measure cam endplay?

Hi Guys, got a Hydraulic Roller cam for the 512 i´m building at the moment, cam button necessary. I got the Comp 206 cam button, it says for mopar B / RB / Hemi. Installation is not possible, the 3 screws for the timing gear are in the way....even if i use allen screws it wont fit in the center hole. Do i have to machine it? Thanks in advance!

Michael

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