Cheapest engine overhaul or used engine? (TCM IO-360-D) - Czech CAA demands a Form 1 for an already installed engine, and registry transfers

Thanks! What I can say now, I don’t want to buy an airplane with expired ARC in another country anymore. It is cheap on one hand, but definitely not cheap at the end. And I am not talking about just money at all, it will costs a lot of psychical energy.