If you put the tailhousing on, you can then use the speedo hole to help mark where the center of the gear needs to be.
Bigger problem is that when using the Camaro tailshaft, the diameter of the shaft isn't right and the gear needs to be shimmed. Several ways to do this, both in our tech tips section and on the HAMB, but the right way to do this conversion is with an S10 tailshaft. It needs to be from the same class of transmission, and if it had an electric speedo, then redo the hole for the gear clip.
