In reality I think for the size of boat an 8LXB would have been a better propulsion unit.
But I have attached the prop calculations from Boat diesel using the basic data from your post.
The 6LXB will do the job but at times you may be up on the RPM closer to 1500.
I am having trouble posting the file as it is a .docx file and attachments have to be PFD or .doc.
Will try again later.
"When I die I hope my wife doesn't sell my toys for what I told her I paid for them"
Money: It's made round to go round , not flat to stack.
"Get out and do it"