A full keel heavier boat can be just as fast as a fin keel boat and the heavier boat will carry momentum through rough stuff better than a light boat. More comfortable as well.
try this one 1978 Spencer 1330 Sail Boat For Sale - www.yachtworld.com
or this one 1976 Spencer S-1330 Sail Boat For Sale - www.yachtworld.com
The Spencer 1330 is a heavier fin keel boat with the rudder on a skeg.
Spencer Yachts is a very respected builder in B.C. The late Hal Roth's Whisper was a smaller Spencer 35
Here's a site where you can find out more (but this one is not for sale)