There are two main factors when adding FI to any vehicle...
1. How well maintained the vehicle has been it's entire life
2. Quality of parts and tune being applied
If you've owned the car for at least 75% of the mileage and maintained it properly then you're off to a better start. That being said the amount of money/time needed to run a turbo properly even at low boost probably isn't worth it if the car is your daily driver.
There's always a chance of mechanical failure with a high mileage car and that variable becomes exponentially larger after FI.
Not trying to completely deter you, I know of guys running boost applications on their cars with higher mileage +150k. Two 2v's with upgraded upper intakes (ditched the junk plastic stock unit) and an 03 Cobra 4V (109k).
12 Black GT500 SVT PP l 2.6 Pulley/Idler l Airaid l o/r X l 305 NT555R's l Recaros l
04 Azure Blue Mach 1 / 03 Sonic Blue 3.8 / 14 Sterling Grey F150 FX4 402A 5.0 / 11 GT500 R.I.P.