The decision to replace or not has always been easy for me. I pull the injectors and then can't get the heat shields out so Icrank the engine over a few times. Blows the shields right out all over the place and I can never find them so they have to be replaced!
Seriously, they aren't free, but they are cheap enough to do on general principle. Oh, and my new '86 SDL has the original 014 head and 213k miles on it, with green antifreeze to boot! I feel like I should be praying for that engine in church or something.
Sooty: what color interior? If you part out the car, I may wanna buy some stuff.