had a few, both twinturbo, standard, and 24v. i'd advise NOT tuning them as you get little returns for pretty big investments. if you want more power stick in a 24v BOA from a granada as theyre dirt cheap, a simple swap and offer good gains over the standard one.
nice enough to drive around bust most modern stuff is nicer and torquier anyway.
certainly not a car that makes any sense as an everyday running as there is better stuff available for the same or less cash, but if you really wanted a sierra it's probably the most sensible everyday version.
probably quite expensive to insure too, i'm sure theyre in group 15+!