I'm working on this sad Holdsworth Mistral I picked from OfferUp on my birthday last fall.
Two issues held up the tear down. The stem was stuck solid. It took a couple of weeks of PB Blaster applications and daily gentle persuasion with a rawhide mallet before it came out. I thought the bottom bracket fixed cup was frozen too, but after several tries, I took a closer look and saw the markings indicated Italian threads! The bottom bracket shell is 68mm, so it must have been a Monday hangover build and repair.
I should be able to make it ride-able and looking more like a proper road bike using parts on hand. I'll keep the Dura Ace crankset, the Suntour 7 front and VX-GT rear derailleurs and Superbe calipers. After I've put some miles on it to be sure I like it, I plan to have it powdercoated where I work and get new decals.