Hey, Thanks! Your pictures were helpful. Yes, the housing rotates but not the screw pattern. I found some detailed Hartzell instructions here on VAF that saved my bacon. I mounted the frame to the engine as it might be easier. It took (solo) about 20 min to get the engine mounted, most of which was getting tools. This mounts to the airframe pretty easily so the plan was to enable working on all the hard to reach things on the engine then secure it to the firewall.
I am thinking to get the gov parts aligned, then thread the prop control through the firewall, attach it to the loose governor, loctite, safety wire etc, then leave the final 4 bolts for the gov/engine mount for last as the engine/frame is being mounted. I did not want to beat up stuff, including my hands, working in the tight space unless required.
Thanks, again, for your response.