What transfer case in '79?

[1969k10stepside]

My newest addition that I got for free is a 79 short k10.It has a 4spd,I remember that much.Would it have a 205 behind it in that year? I could go out to the barn it is stored in and look but asking here is so much easier
If it is a 205 will the front driveshaft from it work in my 72 K5? I'm converting the blazer to a 4spd if this has a 205 but dont have a front d-shaft for it so if it'll work I will use it too.

Thanks,
Dustin