Although the solenoids from a GM application and a Ford application look very similar, they mount differently. If you buy a solenoid, make sure it is for GM application.

https://plus.google.com/u/0/1126369...5530771442&oid=112636930370126476644

If you are going to keep your 216, it will really struggle in OD with 3.73 rears. 3.90 or 4.11 is much metter.