i say get a job, get off ur ass, earn some money and do what u want, but regardless u need to outweigh the cost of fixing the zc with just trading it for an si, if ur happy with an si and a car that works then trade it out. but remember ur still gonna have to install it which is always a pita and requires the right tools, i dont ever swap out engines for my best friends anymore for free because it just takes so much time and effort and u ways run into problems that are unforeseen which throws the cost up higher than expected but anyway im rambling do whatever u want