Daihatsu hi jet 1983 850 romahome

Hi all I need a new a engine for my van as was just sold one with a clocked engine and also the engine is gone... Although I have been conned out of money I have fallen in love and want to restore the engine... Also can I go above an 850 and what other engines can I use ie Suzuki or bambi any help links trusted supplies would be welcomed I hav a guy who will fit the engine just need the engine ASAP as this is my only car and I have disability issues. Thanks kindly