Hey I would if I where you get rid of the 216 for a 235 or better something with a full oil system they will hold up to a little bit higher RPM's but listen to what these guy tell you I have done 65- 70 with a different rear it had a 3.23 and it tended to lay down in the begining. If you take it on the freeway make sure you have alot of room Between you and the car ahead also you can control the way you drive but not the way they drive!
