That is a nice looking engine. Cannot understand how you have managed to leave it all this time and not start it up and hear the super noise!
That fuel will be OK. I have used many liters of both 1000 mix and 2000 on various engines and can honestly say I have not noticed either being better at starting an engine. Good starting requires good compression. If you have that and follow a sensible method of finding the point you first get a bang, you will enjoy the experience. If you need any advice just say the word.
Keith.