You've done the research, and you know that if you remain at status quo, continued use with today's petroleum products, unaltered, will deteriorate the internal components of your engine. The first option before you is to set your engine aside and replace it with something else. Lay out a master plan for your project before you get this far. Once your engine is hanging from a hook, you've committed to doing something-right or wrong. Remember this original numbers-matching engine is not worth as much to anyone else as it is to the owner of the car that has the VIN tag that matches it. So, hopefully, preservation of this engine is in your plans, and you keep it rather than sell it. Don't get caught up in the temptation that a few bucks for your original engine will offset some of the cost of a new one. Disassemble enough of your engine so that you can put major components in plastic bags, twist-tied. This is the "bag and tag" approach. Store all components up off the floor so they will never sit in water. Remember, "preservation."