It's not necessary to go with the ITR valvetrain...but I probably would down the road. Here's a complete how to cam install, with pics.
http://www.c-speedracing.com/howto/caminstall/cam.php
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2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget