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"... I believe I saw a Don Foster post indicating that the IM shaft timing isn't all that important on this brick..."
You did, it's not, I do 'cause I'm anal (wife says if differently).
"...how hard to turn is the cam supposed to be? It was VERY TIGHT, and I first thought that I had a topend lockup problem which had broken the belt..."
It's not tight at all, but the valve spring tension aganist the cam lobes makes the cam "snap" from position to position as you turn it. You should feel essentially NO binding as you rotate it, other than the spring fotce. That spring force, however, will probably require you to use a wrench on the front bolt to turn the cam.
It sounds from your description as if the cam is not timed. If you timed using the front pulley index mark, you could be misled if the front pulley is beginning to separate and spin on its hub. In that case, the timing mark might point to the Moon. It is far better to set the crank to TDC using the crank keyway and the index mark cast into the seal housing. The service manuals show this method.
In your shoes, I'd remove the timing belt and start over. It's a one hour job, more or less.
The following addresses timing belt installation in the B21/23. Your B230 is similar, but not identical. Look closely at the location and characteristics of the timing marks.
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Don Foster (near Cape Cod, MA)
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