transfer case questions

[black_dog]

I've got a '68 k10 lwb, had it for a couple weeks now. This is my first classic chevy, so bear with me.....
I believe the original tc in this truck was the rockwell 221, judging by the sticker on the roof with the shift pattern and the patched hole to the left of the gear shift. Is that correct? I now have a np205. Is this considered an improvement? How can I identify when this transfer case was manufactured? I have to use two hands to shift the thing, is this pretty standard or is there a trick I don't know?
How far should I have to go back from 2hi to 4hi? I don't have much clearance between 2hi and my seat and I am concerned that I am not engaging 4hi all the way. If it is as far back as 4lo is forward, I am definitely not getting there.
Thanks for any help. There are pictures of the truck in the welcome area.