Sir I am neither a professional nor expert. I did all this restoration job with proper homework & research. Also pw members like @vaqas1 & @Hassan1991 helped alot.
I am unable to suggest you any mechanic/electrician bcz 1nz is not bolt-on in 88 or 94 corolla, alteration in mounts is required, the engine seller from shoba guided you wrong, bcz he just wants to sell his engine.
Better to contact with guys, who did 1nz swap in 88 corolla. @shoaib657 bhai, kindly mention that brother, who swapped in 1nz in his 88.