There is a Salvage yard that I have used in the past that is I think an Alliance member but can't remember there name? Think they are in Ok? I am looking for a 4barrel intake for a 318Poly motor and the factory cast iron is just fine as it's going on an older Motor Home. I was going to contact them and see if they had one.
You could just ask us 318 Poly people, you know: http://autos.groups.yahoo.com/group/318poly/ That's where you'll find the majority of us. ~Jason