In thinking about the question, I realized that several of my favorite Par 3s that seemed to play uphill (CPC 7 just mentioned, Brora 18, Golspie 16, Swinley Forest 4 just mentioned, Ballyneal 11, Sleepy Hollow 3) actually do not play uphill but rather across a valley to a perched green.
Hope Valley 6 is a true uphill Par 3 similar to Bedford Springs 4 noted above. An extremely challenging hole given the large false front, but an excellent one. Pasatiempo 3 noted above is outstanding.
Ira