Where to start in historic special stage rallying?

[Eyebrows]

So I am about to become the owner of a Volvo 66 and I would like to set it up to take part in historic special stage rallies. The main events I have seen are the Roger Albert Clark rally and the British Historic Rally Championship.

However, are these a good place to start out or should I be starting with smaller events? I would really appreciate advice on where to start out and which events to look for. I'm based around Cambridge area.

I will be setting up the car myself and so looking to aim for certain events so that I can then follow the regulations when building the car. Maybe I should build to the full BHRC requirements which should leave all my options open in the future?

Any advice would be much appreciated!