I had an '88 SR Sorrento, which is the sister to the Seville. it was powered by a 4.3LX (205HP) MerCruiser sterndrive.
The boat had fancy fittings and seats. However, under all the fancy stuff was inconsistant quality control. For example, parts of the deck had a good amount of fiberglass (cloth and resin) on them, and other parts just resin only. The poor quality components failed, and the high quality components lasted.
Maybe the boat was made on a Monday?
Had the boat been made with consistant quality, it would have been superior, as the design of the hull was good, and the power was good.
JMO