Amber Marine has a good lower for me to pickup. They were able to piece together one working lower from the three I dropped off. They took the drive shaft and shift rod from my 60 lower and installed it in the long shaft rebuilt lower I purchased earlier this summer.
The problem? My forward failure was a shattered shear pin!
It appears my lack of reverse was the clutch dogs on two of the gear sets were worn out. This comes from idling too high as you are pushing the motor into gear. Click, click, click, grind, grind, grind, fail, fail, fail.
Part F is the clutch dog. It locks into the gear B and A.
For Reference, here's one from a 75hp McCulloch Outboard (source)
If I want a spare lower (which of course I do) I will need to 1) find a new set of gears or 2) have one of the clutch dogs and gear sets welded to build up the corners and then ground down to the proper profile then sent out for hardening. (eek!)