Okay Sonny, think I got all the pertinent manuals. All can be downloaded from here:
Onan CCK ManualsLooks like all you need is a center off (spring return) single pole double throw switch, then a breakout box to mount outlets in. A battery and muffler of course and probably a fuel tank and low pressure fuel pump.
One big concern with these old Onans is the top facing exhaust manifold connections. If left outside with exhaust pipe uncovered water can get in and hydrolock block or even rust internal cylinders. You might try turning engine over by hand to insure engine is free before you invest any more time or money.
Doc
