1965 barracuda rear rear end?

So my 1965 barracuda is all original except motor, 273 bored.30 with a cam and an edelbrock 650 carb. Transmission was built too. So on my first drive, went and got gas then drove around the corner to lay a mean one wheel peel. My buddy followed me in his valiant and said both wheels were smoking. Later that night went over there And sure enough, I had two skid marks going 11 feet(and was going in a straight line):burnout:. I thought this original 7/25 rear end was a peg leg. How did this work? Thanks, -Derek