So, my head gaskets are gone...I bought a complete top-end rebuild kit off of Atlantic British website...I'm thinking my heads are pretty straight as the Rangie has not overheated since I've owned it...If they are straight, should I still go the extra mile and take it to a machine shop to have the valve stem seals, springs and inserts replaced? And whatever else a machine shop does? I'm sure many of you have had experience with this...Thanks in advance