Hi 1296,
I do not know of any myself (UK)but there are quite a few threads on here about insurance ...
viewtopic.php?f=4&t=20392&start=45&hilit=Insurance
Maybe have a look on this one as a few names do come up regularly.
But you are dead right you must be fully open & honest when asnwering any duty of disclosure questions when gaining insurance( I have worked in insurance last 10 years). Make sure you let them know about the modifications and make sure they are then noted on the policy and are covered also.With insurance cheapest is not always best. My two Dollies are actually insured with another company who specialze in classic car insurance and they are not the cheapest but have better policy benefits and extras that are more suited to these types of cars.
Things I would suggest you would want are;
A true agreed value- not market value. That way you know in the event of a total loss/writeoff/theft exactly what you will be paid-make sure the policy does not say agreed value or market whichever is less.
Salvage-make sure you get at least first option to buy the wreck back in the event of a write off. There are always many parts you can salvage and re-use for the next project. Some compainies will even give you automatic salvage rights.
Usage-there are companies who will reduce the premium if the car is not a daily driver or has limited use.
Modifications- Ensure the company notes on the policy AND covers your modifications or accesories that you have on the car. Eg that new you beuat stereo or those super bright spotlight you just fitted? These are sometimes not automatically covered.
Make sure they give you a choice of repairer so you can take the car to someone who knows old cars and can complete the repairs correctly.
Other things like;
No Claim bonus Protection can be handy,
Free windscreen or glass cover on some policies,
Some companies will offer a discount if you are part of a club(the company I am with actually offer a discount if you have a racing(cams) license,
Others may offer a saving if you have only named drivers on a policy eg not just anyone can drive the car and be covered.
Ask others in the club who they are with(particularly ones who have claimed) were they happy with their policy/repairs in their time of need?
Anyhow just a few things to ponder.
Hope this helps.
Baz