Back 'C' Pillar trim - Sorry, finding undamaged ones would be almost impossible - I believe TwosRUs still have brand new ones (I got them for my build) - They are very expensive!..
Distributor for GZE - Actually I do have one, I have completely rebuilt it and it's ready to go into an engine build I'm doing. The engine is a 4AGE running twin DCOE Webers, The Ignition is via an MSD 6AL control module. Why I say this is because I may not be able to use the GZE Distributor if I can't get the 6AL to read the signal correctly. I may need to find an alternative and if I do I will have a GZE distributor that is pretty much brand new! - I won't know for a while so hopefully you are not in a hurry ?
Fuel Tank and Radiator - Yep I have both. I'll find them and see what condition they are in. Pretty sure the Fuel tank is perfect.
If you are planning on boosting you may need to look at increasing the injector size - are you changing the ECU?