From there I spent a ton of time with a sawzall removing all the 40 yr old insulation. This was a HUGE bitch, and will never be repeated. If I do this again, I will simply spray over the old foam with new to fill in the shitty factory job. Way more work than it's worth.
The GMC came stock with a 6500 watt Onan Generator. Not running when I got it.
I changed the starter bracket, new points and condenser (see this is starting to sound more familiar right?) pulled and cleaned the heads and valves and Whalla! a 40 YR old genset purring and making power. A little loud, and a gas guzzler but who cares.
This was a while back when everything was still together actually.
One day we had it running the AC's and all of the sudden the pitch changed the lights went out and I smelled smoke.
The governor had gone out, putting 200+ Volts into the 120 system and frying the brand new converter. FUCK.
At this point I said fuck that and started looking for a honda.
I found a EV6010 6000W liquid cooled genset from another GMC guy and that gets us back to present.
Yanked the Onan (made it into a backup generator for the house).
Made a new mounting tray for the Honda using the CNC: