I just rebuilt an older 610, cost way over 2x what I thought it would and I didn't make a penny of it back selling it after 80+ hours of work. The bike was also spotless, looked and ran great. There is no market for older Huskys, as you will find out when 90% of the replies in this thread parallel mine.
Pick up an plated 05-07 KTM with the bombproof RFS engine. If it has been reasonably maintained it should have had the valves changed to black diamonds. Then you are set for years of trouble free awesomeness with great parts availability for OK prices (compared to Husky)