So many questions, such difficult answers.
You stated upfront your speakers are "mint condition" and "done right". First of all I don't believe any speaker will be mint condition after 25 years -- too many parts will age even if unused. Second, done right -- were speaker cones refoamed with original weight materials? crossover parts replaced with correct values? all wiring reconnected in proper phase? None of us here can answer these questions on line. And all that comes before any consideration about a good amplifier match.
So what can you do? My advice is to find an experienced friend or possibly a member of a local audio club to come to your home to help you evaluate your situation. If neither of those answers is likely, find a dealer who sells quality components (not a big box store) and see if they have any staff or can recommend a consultant to help you out. In that case be prepared to pay for their time. In the long run, I think this will bring you to the answers you want much faster than continuing questions here when there are so many unknown factors.
As you found, many 'Goners are willing to help but your situation seems complex.