Not familiar with boat, but since I've been scouting our next step in boating, I'll let you know what I've come across.
From what I've heard, Cummins are preferable over Cats. In additional to hiring a good surveyor, you will want a report from a certified Cummins tech
In the 36'-38' range, Big Block gas engines are fine, but once you get up into the 40'+ range, you'll want diesels. Given that the 4100 is right at that threshold, those Cummins should perform fine.
Diesels are going to be expensive to maintain, but you'll save money in fuel plus the torque and bigger props will make it easier to dock.
Gas engines are expected to last around 1,000 hours, but diesels should last twice as long. Downside is that diesels are going to be a lot more to replace when the time comes.
As I said before, get it surveyed. Even if everything major checks out, it will give a Honey-Do list of all the little items that will need attention. Remember that some of the best deals are the ones that never went thru (been there, done that).
Good luck with the purchase.
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