Glen,
My comment was not a slam directed at you. It was a response (not a slam either) to those who suspect the crankcase wasn't line-bored and thus the possible crank rotation issue. Way before the engine reaches the engine compartment, the builder (not you) would have/should have rotated the engine for any number of assembly steps and noticed something was amiss. Or maybe it was assembled by the numbers and assumed all would be well. Or by the sound of your add'l description (missing studs, etc.), the builder just slapped this together. Who knows? There's no competency requirement for any DIY project. It's up to the individual.
At any rate. I think the consensus is that the engine should come apart. If the correct pieces are in place, then it might only take a more conscientious attention to assembly; possibly some machine work.
When I bought my "rebuilt" 2.5, I was so skeptical of it's contents (real RS pistons/cyls?), I made purchase contingent upon a partial teardown to verify it had the correct parts. Even after confirming that and taking it home, I discovered there were many other things not done to the engine. I ended up rebuilding it again, but not after I went through the "while I'm in there" scenario we all go through (that's another story).
There are many good minds on this board. Let them talk you through this. The add'l cash outlay may not be catastrophic. If you should decide to do the work yourself, you'll be sure everything is done.
Sherwood
http://members.rennlist.org/911pcars