Has it ever overheated? I ask because you say the head gasket is blown, and you still drive it (some?). You can buy a NEW head for not too much. I sell them for $315 + shipping. This is a new head with a new cam. If you choose to use yours, when you get it off of the engine, see if you can spin the cam by hand. It should spin freely, and easily with your fingers. Leave the 3 cam caps tightened to test this. If it does spin, clean it and have it surfaced, but is you cannot turn it or is tight, you will need to have it straightened first. Then a valve job, and finally surfaced. You also need to make sure the coolant passages (look like eyebrows) on the exhaust side. They are usually corroded excessively due to electrolysis. If your head needs all of this, to include the possibility of cracks, this makes a new head very reasonable. If you have any questions, either post or PM me, and I will help the best I can...