Carb cleaning can be achieved with... you guessed it! Carb cleaner.
If it ran before hand, you probably won't have too much trouble getting it to run again. If you do, it may be just a matter of cleaning the jets out, which isn't altogether difficult.
That screwdriver dent looks pretty bad, but if you put some sealant in there, it'll probably hold up to it. Being on the outside of the block, I'd have to guess it's a return, but I could be wrong.
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