Going with a roller block means when you go to fire the engine no cam break in is needed. That removes a lot of risk. If you wipe a flat tappet cam you will be pulling the engine and cleaning all the metal out which is gonna cost a good bit of money, fluids, gaskets, oil pump, new cam/lifters, and more. Flat tappet cam, no, not for me, I don't need that type of grief.