interior question
 

will an interior from a sa fit into a 83 fb?

yes except I cant remember correctly on what I did to the shifter trims

Yes, with some exceptions. The rear carpet on an SA does not have holes cut out for the rear storage bins. However, you could cut it. The center part of the dash that goes around the shifter is different I believe. As well as the radio bezel and shifter trim peice.

the dash is the same, glove box and other panels are the same. Door panels, rear panels and seats will work too.

Headliner is slightly different some 79 had smaller sunroofs, some 79s and all 80s had the larger sunroof as the FB. Some time though the review mirror changed to include maplights I believe and the headliner was molded to match.