Has anyone got a good shape 25 teeth input shaft 3 line marking on the gear t

Nice pics;
As to the repointing of those teeth,
I would fix them because I can.
but they will run like that for many many years on Fourth, if the brake/brass are working.
(I would only hesitate to reuse Second gear if it looked like that.)
The thing is, it looks like that because the Brass/brake quit working or was manually over powered, which with 3.55s doesn't usually happen until over 90 mph in third gear. So..... in a streeter, not very often, in fact, dare I say; seldomly?
Notta chance would I replace that gear for just those chips.