1. exterior looks very good. chrome bumpers are still intact. not much to complain. even the paintwork is still beautiful.
2. interior looks a bit weary but that is to be expected for a 30 years old car.
3. engine bay is a bit too dirty.
Is this your car since 1981? if yes then congratulations for keeping it as it is now. i believe that there is very few E23 of this condition sitting / driving around in Malaysia nowadays.
If you had just acquired this car then congratulations. you had just purchased a remarkable condition E23 that needed a wee bit of touch ups here and there.
my racun (listed accoring to priority):
1. replace wear and tear components / materials in engine bay / undercarriage. Budget: depends. can span from RM 50 to RM 10k according to the way this car was looked after before.
2. give the engine bay a thorough wash (waterproof the critical components first - AFM, distributor, spark plugs, etc etc). After that apply engine detailer / tire shine solutions onto the rubber materials and black colored components. trust me you'll love the results. Then apply some brasso / autosol onto metal colored components. Budget: < RM 30 for DIY job if you don't damage anything during the process.
3. new tires if the one you have is old enough. Budget: RM 800 - RM 2k according to your preference.
4. refurbish interior / reupholster seats, steering, etc. Budget: < RM 3k for a decent job.
5. refurbish the wheels. budget: < RM 600. Less than RM 300 if you don't mind sending them in directly to the refurbishing service providers.
6. New paintjob. Or at least some good polishing / waxing works. Maybe some touchups on the grille. Budget RM 300 - RM 3k.
IMHO this car looks best with its current setup. Does not need bodykits / sporty wheels etc etc. Congratulations again man. This is one fine example of an E23. Have fun with it!