Here's how I converted and reinstalled my stock 1953 6V starter to12V, step by step.
Yes, the 6V starter will work but, I decided to change it to 12V after 20 years. Be sure and
do as shown in Photo #9 as it makes installation and removal a lot easier. Don't forget the little starter bracket on the oil pan that supports starter. https://www.fordbarn.com/forum/showthread.php?t=211141&highlight=convert+starter+12v