I'm sure in a thread quite some time ago you mentioned the gasket was leaking to the outside. This needed fixing asap as the water/steam being forced through will be wearing away at the block. With how long it has now being left there is a high chance you will now have to deck the block.
Why replace the water pump if it was only the seal leaking? Would have been more sense to fit teh seal with the head gasket.
Head gaskets are still available from Volvo or go with Elring
https://www.classicswede.org/shop/b2...ead-gasket-set
The head will need a skim and likely also need some welding