Update.....
Good thing : I have new crank bearings now.
Bad thing : as soon as the engine is hot, at idle the "tacker-tacker-tacker" starts again
When I rev it, the knocking noise (it´s really sounding like a worn out crank bearing, but I have the feeling it´s more at the upper side) disappears, as soon as it idles, it comes back. Oil pressure better than before, but it does not go up to 30 lbs at 2500 rpm when hot (est 20 lbs). When cold, ok, perfect pressure, but that´s clear.
BTW, only 2 main bearing shells (lower ones) were ready to go (worst one the middle one), but all big end bearings were ok.
What´s normally the next suspect ? Slipped liner ? I read, that normally the 3.5 does not show this problem.
I had this noise, when I drove the car home from the Netherlands and idled out from the highway for a break, but then disappeared again. As the heads are "new" now, I fear it is one of the pistons or a liner. Hope not. But, a broken piston ring will not influence the oil pressure...