Front Beam and 7'' Rims

[moonska]

Hello
For the front of my bug im planning to run 7J by 16'' Fuch wheels, i believe these came in two different offsets. Not sure wot they are but ive been told there pritty 'bad'.
Im going to run 944 turbo brakes and dropped spindles, all of which pushes out the track. I want 2cm oversize wings, but may push to 4cm or even 2'' oversize if there needed. Just wondering how much to narrow the beam by?
Ive seen sum cars running 7Jx17 porsche cup rims with only a 2'' narrow beam. If i narrow it by 3'', will i be able to lower the car and get the wheels in the arches? If not and it involves silly size wings, im guessing i'll have to settle for 6''
Just i love the 'dish' if the 7''s
Any help would be great, as i dont really want to buy the wheels and wings and then find they wont fit! Cheers