There are several posts on the rear end swap whichever trans you go with (I chose the t-5 and would reccomend it). If you stick with the NP you've got there are two types of hydraulic clutch set ups. Both use a master cylinder. One has a push cylinder hooked up to an arm that attaches to the throw out bearing. The other uses a hydraulic throw out bearing. Either way, you can make them work with your truck if you can figure out how to mount a master cylinder and attach it to the stock pedal.
When I did my rear end swap I decided to upgrade to disc brakes in the front and wanted the front and rear bolt patterns to match. I measured the old axel from mount surface to mount surface and then compared the back spacing on the new rims to come up with the width for the new axel. After I got the axel I chose home (paid $100), I had to go through the brakes completely and spent around $200 for drums, cylinders, hardware, shoes, e-brake cables.... If I had to do it again, I would buy the rear disc upgrade kit from Speedway for the same price OR_____ I would have looked for a rear axel with disc brakes.
Whatever you do, grab everything you can that goes with the axel, especially the sway bar and e-brake cables. They'll come in handy!
As far as front discbrake upgrades, they are very easy- All you need is the brackets and you can get the 70-77 camaro calipers and rotors from autozone. Just replaced my calipers and they were $13/each reman w/LLT warranty. Rotors are $40 each.
