Hey Cab, no I don't know the degree. This winter I'm going to pull the motor apart and see what I can improve. I got the motor from a guy that had it under his tarp for 2yrs because the car rolled over while racing, hense the times he gave me when he used to run this motor.
I'm using fenderwell headers, 2"x3.5" collectors that go into dual 3" that exit before the rear tires.
I'm using 1.5 roller rockers