RE: Spirit of The West, Get-go Restoration
A running takeout from a boat that is installing a newer engine would be fine, and very low cost
Since you will never operate 24/7 almost 365 ,just go from place to place , a couple of hundred hours a year , a reliable , but worn out or outdated engine would be just fine.
Far easier to dump in an extra gallon an hour of lube oil , than pay for new and modern efficiency.
What was the "old" engine , what is the boats displacement?