Had a divorced 205 in my '715 initially. Relocated it back a bit so the front and rear driveshafts were interchangable (one less spare to carry). Used a 1410-jointed jackshaft that was pretty much bulletproof. Overall the setup worked well.
Later, I decided I wanted an Overdrive Auto and also the option for a Doubler. So out with the Divorced 205 & jackshaft and in with married 203/205 combo. Also lost the equal length driveshafts, although they are close enough that I can still substitute in a pinch. I like this setup MUCH better. It's just cleaner under the truck, one less driveshaft and 3 less grease points and I gained overdrive for MPG and 4:1 low range.
-Mudog
'67 M715 #165
521ci SFI BBF, 4R100/NP203/NP205
GM D60 ARB/10.5" Det/5.13s/11.00-16 XZLs