What engines are compatible with a 2002 Honda Civic, LX trim?

The current engine is a 1.7L SOHC 4 Cyl. & it s not the stock engine either. I ve been told by many that an important plug isn t attached. Doesn t really change the performance though. The reason I m asking is because I was in an accident with snow, that broke my radiators. I got the cooling radiator replaced but the body shop mechanic did a bad job & added a sealant, that wasn t necessary. Now my current engine is throwing up the anti-freeze/coolant, after changing the radiator again as well as the cap & the thermostat & both sensors & it still overheats all the time. My good mechanic said he can get me a Japanese engine with 65k miles, labor & parts comes to 1,000$. I may take up on this since I can t get another car at the moment, I just don t know I his engine will reduce my cars performance & I don t want that. Any help is appreciated, please serious answers from mechanics or people who have done swaps themselves, thanks!

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