Ok so here it goes, i recently replaced the fuel injectors, new motor mounts, new clutch and new shifter bracket also rebuilt heads and after that the car was running great except for it being loud due to a muffler whole and when i was going to a shop to fix it the car breaks down, i take the oil cap off tell my friend to try to crank it and what do u know cam not moving what does that say? that right timing belt.... anyways i was wondering what you guys recommend and if y'all knew anywhere i can find any deals on engines or should i just do a complete rebuild? i my self don't know how to do it
please help

also this is on a 92 300zx 2 seater btw i also have a 90 2+2 but im selling after i get this one running.