How did you manage THAT? You would need to take down an awful lot of material and I am still not sure it could be done. First of all...could you please post a picture or two? Did you replace the FW bolts with the same head height triple squares? What is the part number and manufacturer of the driven plate?
Compare the old plate (if you still have it) to the new plate....what is the story? Same thing with the driven plate. With the previous specs...can you have the old plate milled within tolerance?
Worse case scenario you could mill down the FW bolts for clearance, but that is only if you have some kind of monster springs and I have never had to do it for a Porsche nor would I recommend it if you had other options....like using the correct parts.
P.S. Get used. plenty of good used parts available and a FW is a great choice. Post a WTB and you will be all set pretty soon. Don't get discouraged at a few setbacks during a clutch, It happens to the best of us.