That is a Classic Parts of America part number. A good unit. Classic sells several conversion units. In the description of each motor, it states whether it clears the choke cable or not. The only one that does state that it clears, is one of the 12V motors. The subject of the choke cable clearance and the terminals needing bent is covered here on Stovebolt in several past posts. Most, if not all, of these Classic Parts motors are Newport Engineering units.
Some can be used with original knob, some can not. I thought the knob and shaft were a "D" press-on fit. Must be a set screw if you can "drill" it out.
Many assembly line components are shipped with loose screws. Workers tend to over tighten, over torque, damage things. So they are told not to torque hardware. Automated torque drivers don't work to prevent and automated drivers can cause problems. Lots of consumer items are shipped with a bag of hardware or loose fitting hardware. Unnecessary and costly quality control inspection is thereby eliminated.
Wipers stopping at a different position each time would be an electrical miswire. Park is electrical. The only "tweak" is wire it correctly.
