'68 Camaro shifter/trans help needed

Daughter's teacher has a '68 Camaro, V-8, 3-speed on the floor. (original
owner since new). It hlocks up quite often when crossing the gate, i.e. 1st
to 2nd, or 2nd to 1st. I checked the bushings, rods, neutral alignment of
the shifter. All good. Very little slop. (only 56k miles). The shifter
itself feels loose. Did not check fluid level, or remove cover to check
shift forks. Any suggestions. He wants to keep it original, so leads on a
N.O.S. shifter would be appreciated.

-- 
Steve Walker
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