A-body help needed for my 65 Barracuda

There were a lot of questions in there and will try and answer them all.

1. The car has a dual chamber master....part of this was panic on my part. I did not pump the brakes like I should have. Also the carb needs different rods and jets (was scheduled to get them installed) and this is why it stalled. I was so focused on not hitting any other cars and turned backwards that it made trying to do anything difficult. In retrospect I should have just turned into the first car so that the damage would have been minor...or maybe throw it in neutral and get it started back up and put it in drive.
2. The brakes are now actually working better than before the accident so not sure if the master cyclinder froze or maybe clogged?? Emergency brake still does almost nothing.
3. I have come to accept that I will most likely have to get a donor car and move everything from mine to it minus damaged items. My resto/repair guy comes out this week to jack her up and look underneath to see if floor buckling has occurred. I hate to take another one out of circulation but may not have any other choice. It appears to me that the bumper forced the outside of the quarters out and forward....I can feel no creases or buckles on the floor boards in the back but we'll see.
4. I have State Farm but not regular car insurance. I signed up for their classic car insurance so not sure where that leaves me. They have treated me right over the last 24 years so we'll see.
5. When I test drove the car and had it inspected everything was ok. One big thing is that the PO maybe drove it 1 time a month and I was driving it every weekend over the last 2 months and stated as much when I got it from him. The brakes worked fine but had softened some over the last month. I was going to take it in for some adjustments but it was stopping.
6. The master cyclinder is obviously a rebuild or orignal. Whatever course I take I will be investing in a new one possbily with a booster. Also have the front discs inspected as well as the rear drums....obviously something is not right with that emergency brake.
7. In retrospect this car may not have been ready for regular driving. It sat a lot and who knows what kinds of things were never discovered because it wasn't on the road much. The PO loved this car and spent 17 years restoring it. He calls every once in awhile to see how I am liking it. I am dreading his next call. Things happen that are beyond our control sometimes....these old cars are not always 100% and I am just glad I am ok and no one was hurt....someone could have been easily behind me going to their car to go home.....I can tell you they would probably be dead had I hit them.
8. The big loss will be that back bumper....it was original and had been comepletly rechromed. It was like new.
9. I was in the process of making minor cosmetic changes but otherwise haven't altered the car mechanically. Was in the process of getting an original radio restored for it and getting the center grill repaired and chromed. Otherwise I was just enjoying her. I have been trying hard not to beat myself up but it's hard not to every time I see it sitting in my garage.

Will post updates and status when I know more. Appreciate all your help and suggestions.