Insurance: visicover.com have an online quote form. Fill it in and see what it gives.
Hangarage: ask at your airport/s, also check any annual club membership fees and landing fees
ARC: from what I understand, it will cost a fortune in paperwork to swap CAMO. You would want to have a chat with the current maintenance organisation to find out what costs have been and what they foresee.
With an ancient aircraft, find someone who knows about them - and the engines - to give it a really good look-over. Not everyone's idea of a zero-timed engine is the same! And just like some garages are better than others, so will be some CAMOs!
Fuel, oil, maintenance, what is acceptable/unacceptable in paint/upholstery etc are all up to your group. There are a thousand ways to skin the cat!