To remove radio:

open ashtray, push down on spring and remove completely. See those two screws in the bottom now? Remove them-and be careful, they like to drop into the bottomless pit below.

remove ashtray frame.

above ashtray frame hole, are two flat springs. Get partner to hold them down about half inch (use couple of small screwdrivers) while you reach your hand into hole and push radio out. pretty normal from there.

All this will make sense after you do it once.

I would personally check (or better yet just replace with good new copper fuses) all the fuses in the fuse box. They can look god and be bad or making a bad connection.

Get yourself a factory manual (paper or on CD). it will save you a bunch of money and make things much easier for you.

Oh, and welcome to the group. Those cars really are great!