Welcome to the Forums!
For your super, the rears (early 944 units, from 83-86) will "bolt" right up in the rear NO problem, it increases your track a few inches aswell, the only thing you will need to do to addapt for the rear is the E-brake system, Kershere makes new end for the stock beetle cables so they will work with the 944 accuating mechanism... OR you can fabricate up a little accuating mechanism yourself (As i did) to addapt it. both are simple methods, the later method unvolves more skill and effort, but also cost a little less, the onther thing you would have to addapt is the E-brake cable sleve deal that mounts into the 944 aluminum backing plate/hub deal, Kerscher has this, or you can get creative with the stock 944 unit by cuting it shorter, and making a "cup" for the Ebrake cable housing to rest in.
FOR THE FRONT, you will need the Kerscher ball joints (about $60 EACH,plus shipping), this will allow you to mount the WHOLE 944 spindle and brakes on the beetle suspention, the beetle used a 15mm ball jount end, and the 944 uses a 17mm.... the new ball joints press into the lower arms on the beetle and have the 17mm end to slip right up in the 944 spindles, you will also have to get a new (i think M10 OR M12) sholdered bolt for the pinch bolt... or use the 944 one if you get it.
Warning... using the 944 spindle creates +2 deg of camber on the front (so you would have lost of POSITIVE camber... not good) as its built into the spindle that way. what some have done is slot the upper mounting bolt on the strut (there are TWO bolts) to move the wheel, making more negative camber. I myself have slotted my strut holes and it works.
For the master cylinder, i dont know yet... as im in the prosses of doing this swap myself. some have said the 944 unit works best, the stock, and a 911 unit... But i have not seen a real POSITIVE YES "THIS WORKS BEST" on any of those options... so i cant say much more than do a search on it.
Also, you would have to run new hard lines in some areas for the brakes, soft lines all can stay the same.
The swap is fairly easy...simple, but not simplistic. it takes some fiddling around and gathering of parts..ect. although, its one of the cheapest methods of gaining more braking power and addapting Porsche wheels.
Find good used parts, at a wrecking yard, yo dont want rusty calipers. you most likely will want to rebuild each caliper. rebuild kits (new seals and sliders) are had from perican parts...ect for around $50 for all four calipers, Porsche dealers can get you them to (i got mine at the dealership.. as my father works there
).
Any other questions? ask. Or better yet, search then ask
Later man,
Jonathan