Hey Jonny, welcome to the Bolt!
There will be plenty of folks here that can help you with your questions. As I am not certain if the bellhousing is a straight bolt up to a 250. Certainly an easier swap would be to a 235/261 since that IS a direct bolt in and all the parts hanging off the engine will swap as well.
However, don't be down on the low pressure babbit engine. If it runs well, why mess with it until you need to? I've convoyed good distances (several hundred miles at a time) with splasher motors and have never had an issue.
Good luck!
