Good to hear Dad is doing all he can to stay busy and sharp. I am wondering if you have gotten a batch of bad head gaskets with all the issue you have had with this one. M/F or Perkins orders them by the hundreds and it could be several years before a batch gets used up across the country. It will be good to see the 1130-1100 back in full time work as a dedicated fed tractor, I hate to just let them sit and not get used regularly.
I got this last gasket from Massey, but it & the last one weren't OE Massey gaskets. The one on order is OE, and they are supposed to be improved over the older OE gaskets. The MF285 doesn't have a place in my heart like the MF1130 does, so I have no problem saying goodbye to it, but the 1130 has been here for 35 years or so. I would have had a hard time seeing it go.