Nice to see another classic owner on the board. There is only a tiny handful of us here, so don't expect too many answers to your technical questions. Now if you were asking how to make your 147 headlights look like a GTA's, you'd be flooded with answers. wink
I can't give you any help because my head gasket was fine, so I have no experience upon which to draw -- plus I've got a different engine, and my Alfa expertise is limited to one car and one car alone.
Please don't feel that I'm telling you to go away, because I'm not, but I'd be willing to bet you'd have a much better chance of getting an answer on alfabb.com. It's an American-based board so there are lots more owners there with similar vehicles, and the parts sources they are likely to mention will be more accessible to you.
If harryf doesn't respond to this thread you might want to try PMing him. Introduce yourself and explain your problem. He might have a few pointers for you.
And as the first person to respond to you, it is my duty to ask you to please post pictures of your ride. It's part of the S.O.P. when new members join. wink