The other guys have posted lots of good info already. Just to add a few more that I can think of:-
1. Make sure the trims are in good condition. Very expensive to replace and very difficult to find.
2. Check rubber seals on doors n trunk. Another part that is expensive to replace.
Also, being a 97 735i, its probably the single vanos M62B35. There could be the infamous nikasil issue if it is a UK grey import model. Also, since this engine is quite rare here, engine parts may be difficult to find as compared to the 728i which shares its engine with the E46 328i and E39 528i. I think the M62 can only be found in either another E38 535i or an E39 535i which is very rare in Malaysia. Other sifus may be able to confirm or correct this tho...
Also, being a V8, general engine related maintenance is going to be more la.... more spark plugs, more oil etc. etc.
If you can overlook all this... you'll be rewarded with a very nice V8 growl
My experience testing a E46 328i and E38 728i (same engine).... you'll definitely notice the 7er's weight.. but what you lose in acceleration and handling is made up completely in comfort.
Good luck!