I'm afraid Porygon doesn't learn recover naturally in Pokémon blue, and you can't teach it with a TM. Sorry :(
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level 40-50
Porygon's level dosen't interfere with it's evolution, because Porygon does not evolve through Level Up. You need to trade a Porygon with another Pokemon game. Once the traded Porygon reaches the other game, it will evolve into Porygon-2.
Porygon2 is a 2nd gen pokemon and does not appear in Pokemon Red. That aside, both of Porygon's evolutions occur when you trade it while it holds certain item. Up-Grade for Porygon to Porygon2, and Dubious Disc for Porygon2 to Porygon-Z.
There is no certain level, porygon evolves when it is traded and is holding upgrade.
Porygon? It doesn't evolve at a level. You need to trade with a certain item attached to Porygon.