In gear ~4000 rpms out of gear redline

[88_turbo_supra]

Okay so im looking at buying myself a 1987 toyota supra mk3 with a m7gte stock other than recent rebuild, and little suspension parts. In neutural itll rev to redline like it should. In gear it only goes to about 4000/4500 rpms the bsvs is broke, ignition cap is gone. I see no other problems but it has something making it do this. Anyone have any ideas? I can attach pictures of what i am talking about to help which i will do from my phone because they are on there.