I have a pair of '87 Forte's and they're fantastic. That said, you should do a search here about replacing some of the original stuff inside. Crossovers would probably be a good start. There are a couple of folks here that can supply new ones that are regulars here. I had mine replaced by Bob Crites, and they're simply an amazing speaker at this point.
Power sources is important to consider. In general, Klipsch speakers, especially the older ones, seem to better with tubes than solid stage. The Forte's are very sensitive, so you don't need a lot to power them, I do fine in a small room with a 6 watt tupe amp. But others use them wih 100+ watts. Again, I would suggest you do a search.
As far as the grilles, they are just plugged. They shouldn't be hard to get off.