with all the good things Im rearing about roller cams. Tell me about cam buttons, the spacing the cam has to have,and a good timing cover to use.Ill use full kit from comp cams, cam, springs, lifters,chain,push rods,ect,the kit comes with the button also,cloyes has a nice die cast cover for the 454-- ill have to call them and see if it works with the cam set up,