The difference between a 6 Bolt and a 7 bolt is the number of bolts that hold the Flywheel to the crank... That said, they switched between 92 and 93.
To know which one you have, check here http://www.vfaq.com/mods/early-late-engine.html this is regarding 4G63 but the 4G64 and 4G63's are extremely similar just use a grain of salt.
Top level www.vfaq.com will bring you to a treasure trove of info.
Here is a 7 bolt motor assy4.JPG
here is a 6 Bolt (Aluminum Fidanza) Fly Mounted.JPG
can't get rid of the destroyed flywheel pix...
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