It''s not really possible for you to get an accurate answer to your question on a BB like this, as an estimate useful to you will depend on:
1. the berthing arrangements you will use (specific harbor, mooring or slip, etc.)
2. the condition of the Cal 34 you are considering purchasing, and the condition you want it to be in (which may mandate upgrades, repairs...or perhaps ignoring things that are broken); and
3. how good you are at fixing things, how full your tool box is, and also how willing and able you are to tackle projects that you will also be living right in the middle of.
Cal 34''s are quite elderly now; they''re also great sailing boats, IMO. An overly general
but also pretty accurate statement is that you will find them in one of two conditions: either fully refurbished and pricey (few) or in a condition where at least some significant work is either required or is looming on the horizon (all the rest). IOW it will be easy to underestimate the costs required to make it safe and useable.
But despite all that, good luck on the search!