This might be a silly question but I shall ask it anyway. I need to change the valve springs in my 350 because I bought a new cam. Actually I bought the whole kit; cam, lifters, springs, timing chain etc... Is it possible to change the springs without pulling the head off? I know it might sound like a crazy question but if I could bypass taking the heads off it would save me some time. If it can be done what tool would I need? Thanks