Something to keep in mind when you try compare boats and engines is that less than half of the boats out there actually have a Correctly-Pitched prop that will actually put All he available hp to the water.I am looking to purchase a 1980 30ft Catalina. it has an 11 HP Universal Diesel engine. The question is, do you think that 11HP is sufficient HP to move that boat against a tide or waves? Any guess as to top speed on a flat sea?
In our case with our 5411, we would have gladly put up with the limited power if we could ensure that when we turned the key it started. There were others issues that a raw water-cooled engine of that age had and we got tired of being nickle and dimed and waiting for parts that were no longer available (even through Kubuta) to be machined....
So do not be afraid of owning an older Catalina with the smaller diesel. Spend your restless nights worrying about spongy decks, blown-out sails, and ancient standing rigging that's 15 years overdue for replacement.
Like all 'net opinions from total strangers, this on is worth about what you are paying, BTW.