[rotorwrench]

A person can run a higher numeric gear ratio and install a Mitchell overdrive if you want the best of both worlds. Back in the day they would have likely used an under/over gear box but that would have been more for pickups or trucks. With a speedster, the sky is the limit.

The gear marking compound is made from yellow pigment (pastel chalk as was mentioned) and synthetic oil mixed to form a paste. I started making my own back when red lead was no longer available. In packaged form, it's available from gear shops, Summit, and Jeggs plus many others. GM has a part number and there is an AC/Delco number but I don't worry too much about where it comes from. I just don't want to pay a lot for it. It works pretty well. I liked red lead paste better but such is life.