i'm going to buy a 1990 Corolla four door tomorrow with 300000 KMs on it. The car runs smooth and no holes

All the rust have been fix appearently. However, i heard this 4AFE engine is bulletproof right?
What sort of maintenance should i go all over again to make it last as long as possible?
Here are something that i come across, please advice for more other things that helps my car reaches 500000Kms.
1. Oil/Filter Change
2. Air Filter Change
3. Radiator Fluid
4. Brake Fluid
5. Tranny Fluid
6. Differential Fluid
7. Proper tyre pressures
8. New brake pads or disc if it goes out soon
9. needed your help on this one
10... so is this one...
i don't mind paying more than $500 because this car is a very good bargain, one owner car and have been take care really well. i really can't ask for more, btw, will rustproof helps? :lol: