use anglefinder on carb flang, check motor tilt from front to rear, you can also check side to side, just to see if the motor sit evenly on the mounts, measure from frame to tranny tail shaft, (both side), see if evenly spaced between the frame rails, then compare that to the location of the yoke on your centersection, see how much offset (if any) you have between center of the tail shaft, and the center of the yoke on the centersection, i would also check the angle on the drive shaft.