Don't have the answers but maybe these links can help. The first one shows how to rebuild the fuel distributor.

http://www.cfmstudios.com/928fueldistributor/
http://www.students.tut.fi/~hezekiel/bosch.htm
http://www.volvoclub.org.uk/k_jetronic.htm
http://www.pelicanparts.com/techarticles/911_MFI/TipMFI.htm
http://www.auto-solve.com/mech_inj.htm
http://www.ncr-pca.org/tech/tech-cis.htm
http://www.asashop.org/autoinc/june97/techtips.htm

Glen

Tech:
http://www.ncr-pca.org/tech/tech-cis.htm  
http://www.asashop.org/autoinc/june97/techtips.htm
http://www.auto-solve.com/mech_inj.htm
http://www.pelicanparts.com/techarticles/911_MFI/TipMFI.htm
http://www.landsharkoz.com/tt/ttwur.htm

Parts:
http://www.atpelectronics.demon.co.uk/

Ignition Distributors:
http://www.durranceeng.com/index.html