I just checked my T/C and the pinion boss is flush with the gasket surface and the pinion shaft sticks out about 1/2 or 5/8" from the gasket surface, so that thread that says pre-72 must be misleading, because this is definitely a 69 engine. The drilling into the T/C boss for the pinion shaft is a bit over 0.6" Any how, now you know what I have and if they fit, I can use them.
Dave
69S