350D flywheel question

I am presently restoring a farmall 350 Diesel. After rebuilding the engine, I tried to install the flywheel last night. The flywheel is attached to the crankshaft flange with six 3/8" fine thread bolts. I got all six bolts started by hand, but when I started to draw up the last 1/2" or so, one of the bolts started to seize up like it was stripping out. I pulled the flywheel back off and that bolt was mangled pretty bad, but (thankfully) the crankshaft threads were still okay. I started to examine the flywheel more closely. Turns out the six bolt holes that I thought were evenly spaced around the bolt circle, are not evenly spaced. Five hole have the same spacing, but one of the holes is shifted 0.10" closer to the hole on its left, than the hole on its right. I checked the crankshaft, same thing. So I had a 1 in 6 chance of getting it correct the first time! My question is this, was this offset done on purpose to make sure the flywheel could only be put on in one way, or is the offset bolt a machining accident? Assuming it was done on purpose, why? Was the crankshaft and flywheel balanced together before being separated for assembly? I did find a sorta dashed line going to the offset bolt hole marked on the engine side of the flywheel (which is not visable to you when you are installing the flywheel) but no markings on the crankshaft. If Continental purposely intended to have an identifier to align the flywheel, wouldn't you think they would do something more obvious that a 0.10" offset on one bolt? Has anyone else experienced something similar?

That was done for INDEXING so the flywheel could only go on one way for balancing of the engine .

Also if flywheel is not installed in time
with the crank, you will not be able to set
fuel time correctly as the timing marks are
on the flywheel.

george