how tidy you want your engine bay all depends on how deep your pockets are... but if you could find maybe £400 you could tidy the whole lot up nicely and net yourself a useful performance gain by sticking a pair of webers in there and losing all that messy K-jet stuff?!
...or perhaps cheaper, get a pot of TFR and carefully clean all that you can, get the radiator surround and cambelt cover powder coated (try swanick gritblast if you live near hampshire - they were really good with my wheels), a new rocker cover (or a mk3 item and polish it), some fancy coloured HT leads with some clips and a Allsmiles header tank, then relocate your washer bottle to the boot maybe and add a strut brace.
Rob