New D24tic, what checks before tweaking?

[Retrohowla]

Hi guys, just bought a 96 940 D24tic auto. She's on 140,000 miles (pretty low IMO) and sounds well.
I plan to tweak her up a bit for a more lively pull away and better driving experience but I'm not going crazy, but before I go tweaking anything I would like some advice on what to check/replace to ensure I'm at a good starting point.

So far the obvious being, full service, cam belts, water pump, check/set pump timing.
Who would recommend I replace the injector nozzles? Will they need doing at 140,000 miles?
Is there anything else I should be checking or renewing before improving performance?
As I say I'm not going silly, this is my daily and I want her reliable and bullet proof still.
I'd just like her to be a touch quicker off the mark and handle hills better, she's currently pretty limp!
Thanks in advance guys