[art leong]

I believe it is totally different The mustangs are race cars the older cars had their hp done with mufflers, very small cams, stock pistons, stock fuel pumps Etc.Etc.
If you put the older cars back to the way they came from the factory. I would agree 100%.
Even the race hemis and max wedge cars came with cast iron manifolds.
The early cars have an awful lot of enhancements done by the racers. The mustangs are done by the factory they come with race headers, a sfi balancer etc.
Yes they are going to make a lot more power than the factory number. But so does a 427 chevy or a street hemi.
How much money does it take to build a competitive a or aa stocker. I'm sure you will wind up close to if not more than the mustangs.