18 Spine Aluminum Case A-833 4 Speed Questions

its a modified unit

maybe wrong but mamopar ever made alu a833 with the 18 spline
feather duster (few) hade alu case but never in big block form
hade an OD alu case it was from 1976 f body
its been modified to a a slick shift
and doesnt seem to have synchro ring either

aint gonna be funny on the street but on the track
huuummmmm plenty of fun

did a few like that but the rear end of my car didnt liked it
long long story

my 2 cents
Bob