My '59 "El Savoychero" was the last flathead 6 I owned, and with a "3 onna tree" it was ok, if not speedy. If we're talking slow cars in general, I had a 1986 Olds Custom Cruiser in immaculate condition, and I bracket raced it a lot. No one could judge me at the finish line as it ran the 1/4 in a little over 60 MPH and in the 20's. It actually never had an ET in the teens. THAT was a real pooch but I won many rounds at the track with it because my competition closed on me so fast at the top end they were either standing on the brakes at the stripe or breaking out. All I had to do was cut a decent light and I got pretty good at that.