GM Muncie 318 different Side Covers ???

[Nils]

Hi,
my Transmission Builder said that the Lever (1. Pic) is bad and the 3rd Gear is bad. The Builder become no prices from his seller (USA) and i am waitind for 7 Monts to get a price. An other garage said that as he seen the pics you see that my Tranny is verry bad and the repait cost €1500-2000. No i have thouht, that a new Tranns is cheaper. But the shipping costs are verry high.
Did any body know if its verry difficult to repair the 318 Tranny ? A Repair Manual or something else would be verry good.

Thank you verry much for your help.

Nils