I would say best bet is The Antique Outboard Club www.aomci.org.
Would be better if you use your original post it will move up each time you post and be less confusing.Still looking for a condenser?
Impeller, properly called a "rotor" is part number 550683. Last time I checked, they were still available through Johnson/Evinrude dealers. Or, a better deal from Brian Wilcox at http://www.chrystine.com/impellers/
Condenser is 300153 and is listed as no longer available. You can use a generic .2 mfd if you find one that will fit in there. Or try www.sea-way.com.