I would also remove the dust cap on the slip and separate them and glean out all the old grease and clean the splines. Reassemble and grease. I would tell you to match-mark the two ends before disassembly, but by looking at the picture (may be wrong, can't say for sure) your yokes are out of phase. Like maybe someone separated them and then stuffed them back together. Definitely don't run it like this. Horrible vibration, blown u-joint, busted oil pan, fire, mushroom cloud, armageddon, etc.
4 little special bolts for the c/v head to tcase yoke.
and as said ubolts for the axle end.
Also, arent all GM 205s front output flanges? That CV is missing the flange on the end. Thats how mine is anyways.
older firsr gen 205 had 2 yokes .
1 was non c/v
other was that style c/v head.
been a long time since i played with that style but check fitment first as i think you have a non c/v yoke possibly on there.
i think its 1/4 or 5/16" fine thread bolts but smaller head than normal if i recall.