I am running a 350/2004R combo in a '64 Chevy II Wagon. The trans is about 3 years old with probably less than 10,000 miles on it. It is a Level II from Bow Tie Overdrives. When I first installed it, the trans would auto-shift the 1-2 shift at WOT at about 5,400 RPM, even with the shifter...