new engine parts are available for all KEI ( 660 cc ) cars at selected shops, complete overhaul kit costs under 50,000
add up for machine & labor charges it will not cost over 70000
it is very easy & economical to rebuild the engine with maximum oem parts. It will be new again and you can track maintenance from day one without any endorsement to registration book
engine from scrap yards will be a blind chance, nobody can guarantee 1000 km performance of scrapyard engines. Swap will be a hig risk bad choice