67 Barracuda- Brakes and suspension on a 5000 budget- advice needed

That’s not uncommon to see down here, but it’s a little unnerving when you’re cruising along in an old car with a 50 year old suspension. Just yesterday a guy was racing a Mustang in his Challenger and they had to have been going over 100
Everyone was go at least 80-85 minimum so it’s not like we were going much faster... plus on Christmas Day the traffic was next to nothing