Well like the title says they are here now, and I am trying to get a hold of the guy who is going to port them for me to drop them off. Guy from Headgames, terrific job he does. 4 ribs signify gt40p's correct?
P's have oval exhaust ports, from the factory. (Not squared off.) Plus, in the rocker valley, they have "GT40P" cast into them. I'm not sure about the number of bars, though.