Looks like we moved to Oregon on nearly the same day! We just spent a few days touring the Jacksonville area and sampling the vino - beautiful area. Driving the Umpqua River Road west of Roseburg and sampling the vineyard wares there is a wonderful excuse to get the old Brit car out for a drive. Amazing how much easier it is to shift gears after a few tasting stops ...
There is a auto repair shop that caters to the older Brit vehicles in downtown Eugene. I haven't used it, but others speak well of it. Always seems to be a collection of MGs, Jags, and TR7s on the lot - "Sports Car Shop" 288 W 6th, Eugene.
The only "T"-series car club in Oregon is based in Portland http://home.earthlink.net/~clubtmg/. There is another generic MG club based in the Salem area http://www.willamettemgclub.org/. I am not aware of anything in your area.
We do have a brand new classic British car club here in Florence, started by me - the Central Oregon Coast British Car Club. In 6 weeks of existence, we've gone from 4 members to 32 individuals, many with multiple Brit cars - Jags, Triumphs, 3 TDs, a classic Mini, Midgets, Morgans, Lotus, and lots of MGBs. I had no idea there were so many old Brit sports cars stashed in the garages of this little town! Our club motto of "We don't do tours unless food, wine, and/or ice cream is involved" appears to be a winner 
Here's hoping a bit of valve work will solve the TF's compression woes. I highly recommend replacing the old points with one of those electronic ignitor kits like the Pertronix for the TF - you won't believe how much better that old lump will start, idle, and cruise at speed. Worth every penny!