My son bought a '96 35 Cabo with 3208 435 HP, and as Scarlett said above get a good engine surveyor that is expert in these older 3208 engines.
The 435 HP don't have longevity of lower HP 3208's. Needless to say my son did his due diligence, hired a hull surveyor and engine mechanic, end of short story catastrophic engine failure on trip from Boston to NJ
Required rebuilt engine and a difficult pill to swallow. So be carefull
I personally owned a slightly newer 35 Cabo, 2006 with Cummins QSC 540HP.
Absolutely great engines and great engine boat combination. Cabo quality is comparable to Hatteras as I owned 5 Hat's
If he can find that Cummins combo will be much better off.
However with all marine engines the after coolers and heat exchanges must be regularly & properly serviced.
Good luck
Roger