The 2.8 rad is a pile of 5hite in all honesty.
It's border line on ability to keep things cool.
The 2.8 engine is not good but with a good rad it could be pass-able.
Have a look at
www.caprisport.com - 2.9 12V and 24V pages
The Sierra rad and fans needs some tin work but cooling issues are a thing of the past.
Worth the work for peace of mind if nothing else.