Hi, all 34 Standard Coupes were 3 window. The 34 Master Coupes had 3 windows if they had rumble seats and 5 windows if they didn't have rumble seats, as far as I know. All 34 Masters had knee action, but in 35 and 36 you could get the Masters with or without knee action. Knee Action was used in 37 and 38 in the Master Deluxe series. In 39 Chev went to the wishbone and coil spring front suspension for the Master Deluxe.
If your body still has the dash board in it, the Standards had the gauges in the center, but Masters had a glove box on the right and gauges on the left.