Youd be stupid to change that (other than maybe barend shifters) given the condition of the bike. Sell it for top price, its all original...

I have an 84 exped, and the bike is great for touring. Anyone who thinks much has changed in terms of the frames in the last 25 years doesnt really understand how "right" this bike was back in the day. The frame holds up against any modern touring-specific bike in terms of stiffness and performance for touring. 6mm brazeons for racks are better than the m5 used on most bikes...

my 2c