You sure don't have much left on that car.
GV is a very tricky brand, and the manual is pure crap. but heres how i've got the engine mounted in old one, mine has been sitting for like a year lol
the shell was all dusty
I can't tell you how many teeth are on the spur gear (middle gear) because i have the 2 speed and its different, but just go by the middle diff assembly pic im attaching and you should be right