I'm getting ready to test start a long dormant engine (~20 years). I plan on changing out the oil and antifreeze, plus the transmission engine and rotating the crankshaft by hand using a socket. I have concerns about the fuel and will be removing it and replacing it with fresh and/or diluting whats there with new (if minimal fuel is present). Current fluids are present in appropriate quantities. The plan is to replace all belts and hoses as well. What am I missing?