Hi Uturn,
Welcome to the rather large club of Catalina 30 owners! I've had mine almost 7 years,
hull #825, just a bit newer than yours. The steering and sheeting were optional for at least the first several years, mine is end-boom sheeted, but with tiller steering, which was probably more common with the end-boom.
On the
International Catalina 30 Association site mentioned above, check out the technical library, they have the original factory parts catalog:
C30 Parts Manual
Resealing/bedding the
portlights is a two person job, I've done it and my first attempt flying solo was a big mess. They are glass, however, not plexi as stated above.
As to the mast, the post at the end of the bulkhead between the
salon and
head is the compression post, but there's apparently also a block that was glassed in below the post and transfers the load to the keel, made of white oak. While it's possible for that to rot, I don't believe that's common. The "smile" was a common issue.
On the A4, as mentioned, Moyer sells a pointless kit for it, and they have a wealth of other fixes for common issues with
cooling, etc. It's a very simple
engine (no
oil filter, for example), and once I cured a recurring
cooling problem, I've had no trouble from mine.
Your A4 is most likely
raw water cooled, don't believe there was an option on that, so you need to make sure your thermostat works properly. It should start to open at 140.
Moyer also sells a fresh water cooling conversion, and best of all they host a forum like this, populated by other A4 owners, it's a great resource!
To be fair, another site
http://www.atomic4.com/ sells electronic ignition, fresh water conversion kits, etc. They also have a prop designed for the A4
power band.