What did this come off?

Interesting manifold, however definitely late modle due to the egr block off plate and I'm assuming it's cast iron so for $350 that's pretty spendy for what it is. Decent used aluminum manifolds are fairly common for $125-$150 even here in Canuck bucks, I'd say that would be a better choice for you and by the time you pay the outrageous shipping to get it across the water you still would be ahead. I wonder if egr valves were used in Aus in the late seventies to eighties on 318's?