Need help with replacing a HG.

[77volvo245]

I not 100% sure if I have a blown head gasket but every time I drive my diesel the temp stays way above normal and I can't stand it. The only problem I have is that I don't know how to do the IP timing. I watched someone do a replacement pump on my car once before but not sure I can do it myself.
I have a spare D24 head that needs to have a machine shop to look over. I'll use the spare head and I'll leave the current head on the motor until the head comes back from the shop. If anyone already has a good head I could use and save me some time and money that would be great.
I do have some special tools that would make the job easier. I've also notice another problem with my diesel it's making a very strange noise. This does not happen all the time but I hear this loud whistling coming form the motor.
So if anyone that lives in the PNW that can help me that would be great. I have a very large shop so we would be out of the rain.
I would like to get this done as soon as possible.

My car is a 1984.5 264 with a D24 N/A

Thanks Taylor