A pair of 20 degree full-depth involute spur gears with 32 and 80 teeth, DP of 16 teeth/in, and face width of 0.75 in are replaced by helical gears. The same hob for the spur gears is to be used for helical gears. The center distance and the angular velocity ratio must remain the same. The helix angle is to be as small as possible, and the overlap is to be at least 1.5. Determine the helix angle, the number of teeth, and the face width of the new helical gears.