1970 CC 35
That sure seems like a long trip to kick some tires!
If you don''t have mcuh experience in boats of this viontage, let alone, this particular model, I''d question making this commitment when you will be faced with a leap-of-faith at the end. Try to find a dozen or two local boats of this vintage to practice on and get some perspective. Note in particular the recent repairs/upgrades some will have: engines, rigs, sails, electronics, etc. etc.
The C&C 35 Mark I is not particluarly uncommon - ask throught he email list and you should be able to find some in you loacl area to look at. They are very spartan down below and not too roomy, but good performance for what should be short-money.
You should know exactly what you want before you go 800 miles to see if a boat is it.