msteuer - yes it would swap right in for your 3spd - the only thing different is you'd need to add a kick down switch to the carb linkage, and a cable actuator under the dash - don't know if it'd be too good w/ a 290 rear tho - maybe you mean the stock 390 rear? from the factory, od equipped trucks had a 410 or 411 rear ratio, so w/ a 390 I'm hopin it'll be a treat, tho don't know if you'd improve mileage unless you're on the highway most of the time . . .
and Blaine - I know someone on the island that might be convinced to sell one - what's the offer?
Bill