Removing Rust from the Block

[Ken T]

I've started digging into the engine and planning to replace the radiator hoses. After removing the bottom hoses a handful of rust fell out. I was hoping not to have to pull the engine. This is what the engine block looks like. I'm not looking at getting this into show car condition at this point. Maybe in the future. Just want to get it running. Is there a way or what is the best way to remove the rust without pulling the engine? I've read Evapo-rust works, but not sure with this amount of rust to remove.

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