Welcome to the Formula233 registry and congratulations on your Formula 233 purchase. I have read some information about these out drives. They were branded under the Chrysler 300 outdrive and were similar to volvo penta outdrives. I have located a website that might be able to help you with parts. Contact Hurrikain.com and see id they can be of service. I am not affiliated with the company just found in my search. I understand a conversion to a volvo outdrive would not be a problem if serviceability and/or reliability become an issue. Good luck and happy boating!
How a coming along with your restoration? Do you have any additional photos of your project?
Good luck and hopefully you will have it in the water Spring 2017