350 trans to 205 transfer

[llama]

trying to put a newer 350 tranny to a "72" 205 transfer case. i need the adaptor and talked to advance. they say i have to change the tail shaft to a ten spline. tail shaft and adaptor $650. i'm wondering how it was done in 72? 350 trannies have not changed and i understand they are all 27 spline. all 205s are 10 spline. did the original adaptors take a 27 spline tail shaft and a 10 spline transfer case? what do i need? this problem is holding up the project, thanks for the help.