Wow, a rare U shape dinette layout. Here are a few more things to check, many of them critical:
- Lower chainplates - if you have the U bolt style you're good. If they are the square top single hole style they need to be changed ASAP, available from Catalina Direct
- Wood spreaders - must be checked for rot especially at the inboard ends under the aluminum cheek plates. Some owners convert to aluminum (Catalina Direct again), others replace with wood.
- The engine harness trailer plug you've already seen - you have at least two in the harness, possibly a third. Get rid of 'em.
- Catalina factory waterlift - it's known for cracks and leakage at the base.
- Aft lower knee bulkheads - known for rot and yours are the originals. Better check the main bulkhead while you're at it.
- Mast compression post support in the bilge - known to rot as well.
- Anti-siphon between the engine and the exhaust hot pipe is missing. The factory installed one, looks like whoever did the engine work removed it. Good way to backflood an engine.
There, that ought to get you going.