Yikes , that had the potential for a horrible outcome so first of all glad you're ok and secondly the 968 is ok...
Patience ( something I've never had ) has become a necessary evil with my 968 saga . At least, with respect to this latest drama the further delay and an additional trip to SoCal are the only downsides for me ; the mechanic said no matter what the repair or replacement time and expense required may be , this is all at his cost .
I was there Friday to hear and feel the engine run before everything is yanked out again, which will happen Monday or Tuesday . The crack is about 1/8 " , lower half of the block close to the motor mount next to the exhaust manifold. He is fairly confident it can be easily welded, it's not close to any edges or gaskets or anything of the sort which can be compromised. However he did say that once the engine is out again and he can closely examine everything, if he thinks there is even a 1% chance the repair might cause problems in the future he won't do it, and will replace it with a new block ...all parts & labor free of charge to me. But I'm told welding a block, and in particular a crack as minor as this one is a completely safe and permanent repair and that I should have no concerns whatsoever . ( in fact he said the crack is so small even a high heat JB weld adhesive would have sealed it permanently, but he claimed that's a " Mickey Mouse " way out and not the right way to fix something so out comes the engine once again ..) Fingers crossed, that's the end of the drama with this car...that is, until the next time I see that gypsy caravan and an all-out war breaks !!!