Go back a few days and read this post
Topic: 216 top speed???
There is a lot of other things to take into consideration when you want to run at higher speeds in old stovebolts.
Myself I figure if they wanted in front of me they would have started 15 min sooner...LOL
And when they see you in your bolt you will get more thumbs up than in a brand new Duramax
The mentioned post is well worth reading before going 70 MPH........be safe