well firsth thing i would be check is that if your heads valve spring pressures are not going to adequate. some cams depand certain valve spring pressure on the cam. you can do some damage. now if your putting a new cam in and you don't want to have a worry about your valve train, get new lifters. yes roller are expensive and i recently have figured out the benifts. being a roller motor to being with, no retro fit are necessary. on the head stuff i'm sorry but i don't know those castings right at this moment