Just an update. I added Seafoam injector cleaner and ran the old gas down to under 1/2 tank. This was after I changed all the fluids, oil, trans, diff. antifreeze. The engine smoked during most of the running of the old gas and cleaner out. After that I filled it with 93 octane and added some more cleaner and the engine began to smooth out and most of the smoke stopped. I haven't had enough time to get it out on the road, but that is my next plan, as soon as I can put a couple of hundred miles on it. I hope that will clean all those gummed up parts and areas. After that, I'm going to replace the fuel filter and check the fuel pump. They both appear to be almost new, so in the past, they have already been replaced. As I said, it already seems to be running better, so with additional cleaning and fresh gas, it just might do the trick. I will let you know and wish me luck.