Sorry to necro this post, but I'm in process of moving and made a heck of a discovery.
Turns out I was given a sleeve of info with the car that I tossed in a box in the garage and never went through. Included is detailed records going back to 1986.
Also a record of the incident the car was is in on 2/14/00, and an itemized repair bill for $13,084.89 from 20 years ago.
Also a record of trans rebuild from one of the best in the business, which explains the John Walker Workshop sticker in the engine bay.
I've continued to enjoy the car, though I've been driving it less, and have been slowly returning things to stock here and there. This find makes me think maybe I should take another crack at selling it. There's not a lot of comparables in the classifieds right now, has the market changed much recently?