Need to watch the fuel tanks on the early excaliburs. Known for cracking. Kevlar has a gold color. I remember something about Kevlar deteriorating over time, like 'drying out' so to speak.
That one pictured looks cool, but it'd have to be pretty close to free. Lots of potential, but for what you can get a clean good running 10 meter Fountain for, well, ya know....
I know a guy locally who totally restored a 31 Excalibur. Boat has the pad bottom, he converted to bravos during the restoration. With 450HP or so 454's, I believe it runs low 70's. Very cool old boat.