I'm guessing you have the TBI 305 in that Camaro. Then you have 170 hp.
The LB9 is the Tune port 305 and the L98 is the tune port 350.
FYI, the TPI 305 with a 5 speed had a more aggressive cam then the same motor with an auto.
But just looking it seems the 3.3 made 170-180 hp at 4800 rpm.
My advise too you is too change the fluid in the diff in your F-body. I know for a fact that if you have an LSD in that car you should spin both off the line for about 25 feet.
You pathfinder is simply a LSD rear that is operating correctly.