X-heads / 6 Barrel combo porting

How did the fitech setup turn out? I was looking at doing that to my 340 powered 67 dart gt vert. Seen a lot of bad reviews about fitech. Called yesterday to ask if their instructions were correct that you can't use Al 6 or 7 boxes. Waited on line for 17 min to get a representative only to be told that my AL6-2 MSD box would work and the instructions were wrong. Told the rep I am not impressed waiting so long for service questions only to find out their instructions sheet was incorrect.