I was up in Mill Creek two weeks ago and took a tack in towards your slip. The 34 looks like a very nice boat. I would enjoy seeing her up close if it works out conveniently for you.
I am assuming that the Peterson 36 is the Contessa version that was built in England. I''ve never sailed one but I understand they were very similar in sailing characteristics although slightly faster (111 vs 117) than the 34 which are a very well known quantity.
These boats were pretty fast for their day upwind (but quite slow by any modern standard)and were slow and tricky to sail downwind by any modern standard.