Metal fillings in oil and cam will not come out

[BLT gmc]

The engine was hot tanked by the engine rebuilder. All the machine work was done by the same shop. The block was line bored because of a past thrust bearing failure. Block was planed and bored. Cam bearings installed. All oil passages cleaned and plugged, soft plugs installed. To help with time I had them assemble the long block except for the intake. Yes I was knee deep in it after work until it got dark. Bad news is I can not get the cam out. It moved ~2 inches forward and that is it. Turn all you want, pull, push. Will not come out does not seem to want to go back in. Face of the #7 and #8 cylinder tappet look rough/pitted. Other tappets look great. I believe the bearing has spun in the block and is welded to the cam. I will have to borrow my friends scope to get a closer look. I am pretty sure the engine builder is going to hang me out to dry. Any good ideas how to get cam out? My other thread was closed. Bruce