Looking for more input on my first 67-72

[MattPSU]

I'm going to look at a reasonably priced 67 C-10 this weekend that's missing some of the features that I'm looking for in a truck but appears to be a straight, solid bodied truck with a healthy V-8 and automatic transmission. I'm looking for some input on what it might take - work wise and money wise - to add these features:

Power brakes
Disc Brakes
Power Steering
6 to 5 lug
A/C

I also have an opportunity to buy a truck with all of these options for about twice the price. This truck is pretty much complete, but would wipe out my budget and leave me with no money for a while to make any changes (wheels, stance, etc.) that I would want to make.

If you've converted your truck from not having any (or all) of these options to having them, can you let me know what to expect?

Also, is it terrible to have a truck without some of these options? I don't plan to drive it everyday - just here and there once a week or so.

Thanks in advance for any input.

-Matt