Wannabe, in that photo above of the gear synchro and the ring, the space you're looking for is BETWEEN the two sets of small teeth- the other side of the small teeth from your screwdriver bit. So no- you have zero clearance and the synchro ring shown is junk. It's likely the gear cone the ring is supposed to fit onto is also badly worn and needs changing. With so much metal missing, this ZF will never shift well.
I also see rust on the parts shown: have you been following the previous threads on changing ZF lube yearly? Currently, there are two ZFs in U.S shops that sustained over $5500 in damage just from condensation build-up in decade-old lube....
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