I assume you already searched this site so here is a website with VPP based certs. These aren't complete polars but "best performance" examples on the certs.
You can find a similar hull/design to get an idea of what yours would be. Similar 34' boats of the same era would be pretty close Catalina, C&C, Cal, or Hunter. Just pay attention to sail area/displacement numbers and sail configuration for the cert you look at.