These namby pamby Mopar flatheads in road cars... nice, but not the ultimate...
Do you know that Chrysler once contested the Le Mans 24-hour race with factory cars?
And on several occasions, flathead 6s ran in other races too. Not forgetting the one I know a bit about, the Australian Grand Prix.

This car, with an engine carrying twin carbies, probably a small ZSB engine, sitting on a tubeframe chassis over a set of 1940 Ford suspension and driving through a Vauxhall 4-speed gearbox, was at one time running third in the 1951 Australian Grand Prix. It faded to fifth, but it was a brand new car at the time.
I plan to build a replica of this car if I can find the Ford brakes.
There have been others, but my point is that the old flathead sixes did cover themselves with glory from time to time.
Who can tell of others?