I just bought a Cal 39 1983 last month but she will be going into dry dock for about a year so we can go through it. I was only able to do a walk threw once and I made a low ball offer that was excepted. The boat is in AK and will get moved to Homer next year. Any an all information would be great, I'm out of the country right now until Jan by then we will try and get some work done then. I am trying to find the mast height right now. Are they all the same height of that year and model. I am wanting to put a furling system on for a genoa but am not sure what size to go with.
If yours is truly a 1983, it's a MKIII. The MkII was built through 1982 and the MKIII began the next year. Looks like there was a standard and a tall mast version so you will need to do some measurements.
CAL 39 MK III sailboat specifications and details on sailboatdata.com