Paul,
Not trying to be a smart a$$, but the early injectors(OEM ones) are susceptable to ethanol induced failure of their coils, I think 90 thru 92 yrs. Just a fwiw.
On the excercise subject.......yea man, do it!
The Z will love for you to flogg it regularly. I learned that slowly and now that I accept it my Z is sooooo much happier.
Tom