Cruiser Class JBoats
I have a 1988 J/34C and have a number of magazine articles describing the boat. Beleive that there was also a J35/C and a J37/C. The J/34C has a winged keel with a draft of approx. 5''. The other "C"''s probably have fin keels. Was looking at a J40 recently and it''s layout both above and below decks is similar to the whole cruising line.
At boats.com you can check NADA for J Boats and see what models they built each year.
Are you looking to buy one?