[norustscott]

On the heads...for go the porting and polishing...Unless they are done and flow tested I would be suspect to any gain. Spend the money on new seats where needed, valve guides and a three angle valve job. Valves can be reused, however, check the valve stems for mushrooming damage and the keeper grooves for wear from valve float. Check each valve springs for fatigue. Replace rusty exhaust studs now...not when one breaks of during engine exhaust install.

The case was not painted at the factory...If there was a benefit to painting then your engine wold have paint on it. However, I have heard that a light coat of flat black paint can assist in heat transfer. Paint the cylinder fins with the flat black and leave it at that.

The cam gear is a bit of a mystery. Check the crank gear for damage too...

Other thoughts guys?