Specs will vary depending on a variety of factors: Driver, weather, condition of the road/vehicle etc. Based on pervious reviews
We have 0-60 best of 5.6 (AutoCar 1/91& Road & Track 1/90) and a worse of 6.6 (Road & Track 1/91)
We have a 1/4 mile best of 14.2 (AutoCar 1/91& Road & Track 1/90) and worse of 15.0 (MotorWeek/Road & Track 1/91)
I would say it is safe to say that the Mondial t coupe is a high 5s low 14s, and the Cabriolet is mid 6s, high 14s when it comes to off the line.
Numbers that are nothing spectacular circa 2017, but excellent for a car over 3 decades old. 6s and 14s still reasonably sporty for a 4 seat convertible even today as well.