T & D Roller Rockers i purchased a set and would like to hear from those that had them installed. One do they just bolt on, do you need new pushrods. Does the heads have to come off as the instructions says, i find that hard to believe since it's hydraulic lifters. Any downsides to this plus any upside to T&D's i am trying to follow the Chrysler package for 50rwhp. I have the headers and exhaust, the performance computer, K & N's. Any e-mails will help thanks.