Here's a couple of brief articles on ign coil construction.
Looking at the schematics, I think the only way to possibly know best orientation without an ign scope on the secondary output would be to have an ohmmeter sensitive enough to pick up the additional .5 - 1.5 ohm of the primary winding reliably. The terminal with the least resistance to the tower terminal would be the one the secondary coil end is attached to--
Don't really think that method would work as I don't believe one could get a reliable reading with the difference of +/- 2 ohms in the secondary coils range between 7.5 - 10k.
A couple of articles mention some coils having the secondary end attached to metal case instead of the primary terminal but I don't know how common that is & don't recall ever checking for one. The description & picture in the Packard Ign training book almost makes one think the dash mounted coils may be constructed that way though.
http://www.delmarlearning.com/samplechapters/dl_display_sampchap.aspx?isbn=0766806731&cid=23http://www.sentex.net/~mwandel/cannon/sparky.html
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