I'm currently restoring a WR 400 as well, and one of the most helpful sources of info has come from the HuskyOwners group at yahoo. I would also recommend that you check out the PVP Cycles website -- great sources for parts for the WRX.
I'm not knocking the Husky Club, but you should check out the recent comments about it on the HuskyOwners Group.
I just bought a 86 430 WRX engine and whole bunch of other goodies from a guy in delaware for $250.00. All of the engine seals and bearings only had one hour on them, so I'm going to press them out and use them on the 400. Also picked a pristine 85 WR 400 piston, head, and cylinder (and other odds & ends) from another guy in Washington -- I'm going to use for the rebuild as well. The only new parts I needed was a crank rod and a complete gasket set. The rod alone was $250.00...The point here? Mid 80's husky parts can be found, but the new oem parts are pricey...so when you can find spares parts and it won't break the bank, buy 'em!
Good luck!
John