It sucks. I'm grateful that although the bodywork of mine needs attention, that it is fundamentally a good basis. My floorpan, chassis, sills etc are in really good condition.
I am of the opinion that once a car is a snotter, it's next to impossible to bring it right back. They are out there, but sadly you're narrowing your odds by wanting a 90 spec car too. It's the right choice, but will make it massively more difficult.
Personally, I would be patient and wait for the right car, settling for a shit car will be a mistake that you will always regret, especially if you have been spoilt with a nice one.