Jim gives good advice on the 104 head removal. It is a different animal than the 103. I believe on the 104, however, you will be better served to pull the head with the intake manifold attached. If you have an overhead crane this will be easy, if not, you need a friend that's willing to get dirty.
The 103 is DEFINITELY easier if the intake is left in place.
I don't remember the tensioner being any problem at all. Simply push the plunger all the way through then start it through again, it is a ratcheting mechanism. This holds true for both engines.