Its prob pointed out in the ad.. but theres no shock on there, so make sure you're ready to deal with that.. Given the design of the bike (lightweight cross country) and the age, I prob wouldn't be putting Cyclone levels of power thru that back end.
Fyi, I have owned and serviced many different FSRs, so not bashing the bike, but its a fact old aluminum gets brittle, so really look it over for cracks, esp where the link attaches, and the lower swingarm. It's also a really old one that doesn't have mounting tabs for disc brake on the rear, so something to factor in.