First welcome to the site. Hope you find the information and support here helpful in your restoration endeavors
Might want to incorporate some information about your car into your signature. Its going to be needed for allot of your questions and the following discussions.
As far as suspension there are plenty of threads and articles in the library that cover restoring and original finishes for those items both front and rear of the car. Search is likely also going to be helpful. Painting everything black would be something that might get suggested on other sites but not here on this site
Don't think we've covered 70 San Jose specifically but black would not have been what was originally used.
Has you car been stripped or is the original finishes still there? You will want to look and document the bottoms of the front frame rails and the main floor. The more oil soaked or protected of areas the better since they will likely have held up better. If those are all gone (not likely) then provide when the car was completed and I'll look to see if I have records of another example built around the same time frame and plant as yours.