The Fastback History Forgot In 1968, while everyone was chasing big blocks, Plymouth slipped something clever into the compact Barracuda. The ’68 ’Cuda Formula S 340 looked mild, but that high compression 340 small block was a gem. Factory said 275 horsepower. The National Hot Rod Association wasn’t buying it. They factored it closer to 325 plus for classification. Light nose, four speed, Sure Grip rear. It could run mid 14s bone stock. That’s not a fish story. That’s engineering with attitude.