I used to have a 1986 27' Excalibur. I can't give you a whole lot of info though. I know Wellcraft owned the name & built them for several years.
As far as the boat goes, mine was very solid & handled very well but It was not a rocket ship by any means. Even with bigger power, it never reached more than about 65mph. Everyone I talked to said the drive height was way too low. I never got around to raising everything. As I recall, I sold it for around $15,000 many years ago.
Oh, welcome aboard!