To easy to speed?

Ok, ok, i am fully expecting to get harrassed about this. We all know that our Vettes are "Ticket Targets", and being a truck driver for a living, i carefully gaurd my driving record, so tease away. But, serious I am keeping my '74 as a daily driver, but it is presenting me with one problem. The local speed limit is 70, and its a very very light touch and short time between 70 and 85 (ticket trouble). Just a short distraction and its over.
What i am looking for: is there any way that i can not limit my Revs (still want lower gear fun), but can limit my upper speed to say 75? a warning light, beep or something that can help? thanks!

Just install a rev limiter, but also install a bypass with a relay and toggle switch to turn it on, or bypass the limiter. Switch it on when you are crusing.

Thank you Zen Maser Ken! I knew someone here would have a working answer for me. New project for tomarrow.