The Jimmy's were a match for the flatheads in their day. This is Saugus drag strip, the first drag strip I ever attended. My dad took me there in 1952 or '53. The track opened in 1951 and closed up in '57. This old digger ran 10.4 at 136 mph. It had the original three-port head at the time.
Another view, this time at Santa Ana, and with a body added. And still with the three-port stock head.
Looks safe enough, doesn't it?
Updated with the Wayne 12-port head, and Hilborn injectors.
Here's a photo for the ages. A single axle oepn trailer. The "tow rig" is a 1938 Chevy.