The Carltons and Senators were very well-built cars: not too far behind the Mercedes and BMWs of the time, as I recall. They were the mainstay of Police fleets for years, which tells you a lot about their basic reliability and ability to withstand abuse.
I'm sure engine parts and running gear consumables (suspension bushes and units, brake pads & discs etc) will be readily available, you can check on sites like Eurocarparts.com to see what's out there.
The problems with cars that are nearly 30 years old are in the electrics (look for dashboard instruments that don't work etc) and things like silted-up heater matrixes, which can often need major interior surgery to get at and fix.
An older can will always need more of a hands-on approach to maintenance, but you may be lucky and get a good 'un. Just go into it with your eyes open.
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