One of my friends has a 2001 ZL 440 and it will do 90mph on the lake. They are good sleds. Another friend of mine had a '98 ZL440 and he could keep up with out ZRs through whoops even with the softer suspension. He had over 7000mi on it when he sold it and it was still running good.
If you want some fun, slap a 56-50 helix into it, yellow spring in back and yellow/green up front with a-2 weights! you will have fun! I did this with my prowler, and the bitch pulled hard! like 4-6 sled lengths on a stocker, my bro had a prowler, and I had one, mine was clutched and tuned right, and smoked him [email protected]!