The Spencer 35/42 are both long keel designs similar to the Alberg 37 and many others. Very solid boats many of which have crossed oceans and circumnavigated. The late Hal Roth's Whisper is a Spencer 35 and a neighbor is currently near the Horn in his 35. The Spencer 1330 is a more modern design with a long fin keel and a rudder on a substantial skeg. All were very well built. Here's the link to the owners group SYOG-index
Here are the profiles of the 35, 42, and 1330 There is a later version of the 35 with a shorter boom and a slightly taller mast and a squared off rudder.