According to the Fiberglassics Library the Cambridge model is 15′ long with a 68" beam, 61" transom width, 400lbs. weight, 50hp rating. From the Fiberglassics main page, click Glassic Library, scroll down the Fiberglass Boats column to MFG and click. After manufacturer history is a model information page for 1955 to 1959 models. Click on the page to bring it up. Kinda hard to read, but I already gave you the main info. Good luck with the boat.
If you have too many, AND not enough, you're a collector.