Is that even worth it ?

Hello people, I am thinking back and forth about what I should do, ….here my problem… I own a Jetta 2 Bj 92, with 90 hp …1,8l The car goes from the optics, it has the usual traces of use, but from the engine it has already 255000 kilometers down. The things that are defective, I mean in the interior like coming down sky…. I can repair that myself. I would like to tune and build up my car now, so that I mean chassis, clear glass shain thrower r, alu rims etc. but it is worth it with the old engine because even to put so much money into the car still? If I drive with the car, then he swims very much back and forth (shock absorbers and bearings are new) and the motor clacks very loudly, if I turn off the car the motor is still jerking after something, al in all it is a rather bad driving… what do you mean ? should I rather leave the car like this and save it with 3-5 tausen euro and then prefer to pick up new ones or me in money always put in the car ? hm…I want if yes try to do everything that happens myself but right now I can’t do anything as I said yet ! have also niemenaden which could show it to me … thank you for your advice !!!! your hyprix