The Vinci cam was their 062 cam. I think it was 210/218 .551 .551 112lsa
The GT2-3 is actually smaller, Can't remember the specs but it's posted on this board all over the place.

 

I think you are definately see a drop in PSI. How much, I am not sure? I have heard that tighter LSA cams will help a blower setup in the high RPM ranges. In other words, where the blower levels out, the cam will continue the powerband. That is what I have heard, not sure how true.

 

I have a 112lsa cam the one in my sig with the kennebell blower its getting dyno tuned next mondayil post the results when I get them.

 

I've got the tsp 224r on 112 twelve and with the 3" pulley I'm making 5lbs of boost (p&p heads) with 470 hp and 490 trq. That's with the stock converter. This cam lopes nice and then it get's up and goes. This is the only approach I would take. Not everyone likes the stealth option. I think alot of guys on ls1 tech are running cams with a split duration and a low lsa, because the blower pics up down low and the cam pulls hard up top!