Purchased another 89 XJS needs head gasket

So I am currently working on a nice BRG 89 XJS and it’s coming along pretty well.
I came across another car for sale locally near Chicago. This one has a very solid chassis and body as well. Apparently it was parked due to a bad head gasket. Clearly I bought this car for very little money with the thought of one fixing it. Or two parting it out and building a nice spares inventory for my car.

Question is how hard is the head gasket job. I have read it can be very difficult to remove the heads. I am weighing my options here and will have too look more closely at the car before I decide which direction I will take.