May want to give these people a call. i have had 2 of their units, no frills but wotk well. v vA 6,000 BTU unit wold be enough to cool a 260 Dancer in your part of the world.
http://www.arcticmarineair.com/
Previous owner put this crap on my boat. Best thing I found to remove it is a soap from Home Depot - ZEP, spray it on full strength and wash off with clear water. When you spray the ZEP on it will dissolve the polymer and turn it orange. Don't let the Zep dry on the gel coat. Just my .02...
I have done the Tenn-Tom once and the Tennessee River four times, the Cumberland once. Will probably do the Tennessee again, prettier and plenty of accommodations. About mid October is the time to do any one you decide.
I had a 220 Sundancer with the same problem, the cable was bad. you have to move the cable to excite the power steering. Replace the cable, problem solved. JMIHO
Quint,
I have run a 4 blade on a 250 Dancer, really liked it. Quicker out of the hole and the boat ran flatter when on plane, seemed to raise the stern a little. If I remember correctly, I dropped the pitch 2 degrees. In fact it was a Powertech prop, manufactured here in Shreveport.