I put rotators on every engine I put together as long as I have them in stock at the time. They are a little hard to find.
Because they make it so the valve closes in a different position every time it closes it helps to prevent a burnt valve.
They are used on many V8 engines also.
The only bad thing I have ever heard about them is that they are a little heaver and can cause valve float at high RPM. This may be a problem with a V8, not a 236/261.
I say use them!
