Help I had an accident today ...

Depends on the insurance company he has. If he has a collector car insurance company, then there is an agreed value on the car and they will repair without totaling the car.
I feel for you. In 2005 I was rear ended in my '69 cougar. I got stuck behind an idiot not going when the light turned green and an idiot lady not paying attention that rear ended me at about 25-30 mph. Sandwiched the cougar. Both 1/4's buckled, rear pushed in, front damaged. $7000 in damages. We fixed it. Nice thing about these old cars is they were built with mild steel so you can pull them back into shape with a little massaging. Yes, the original 1/4's on that cougar were pulled back perfectly.