Hey Chris! Welcome. I'm about 90 miles away, near Prescott. There are more than a few members in PHX and surrounding cities.
Looks like you've got a good head-start with the 550! May I suggest adding a front brake?
If you and your bike are up to it, the SOHC relay will be passing through AZ in late April. The route hasn't been pinned down, but the idea in general is for the relay to enter AZ at Duncan, then head North-west to Kingman, picking up a chunk of old RT 66 at Seligman. You are officially invited to join the fun!!!
Scott
PS, how about some pics of the Trumpet? I like the old British bikes (had a '53 BSA 650, and a '71(?) BSA Victor Special), and besides, we all love pictures!