Dont most turbos have the A/R #'s cast into the housing somewhere for ID purposes, so there will be no confusion as to what they are. I have one off of a GNX Buick that has it cast into it, and most others I have seen do also.
I asked about marking, thinking as you do, he said there were none, then informed me in not so many words he wasnt an idiot. haha People.
Ill take a look at the suggestions.
About how much are the master power turbos going for? I think we wanna go low buck as possible. Suggestions were made that if this turns out positively, then a trubo bent 8 would be next.