A stock 4-V 66
stang with a high gear rear end would really-really be pushing to reach the 140 mark. I could be wrong, but i seriously doubt it.
However, we all still like the 140 speedo. it makes us think we can if we wanted to. Personally, unless I had some improved suspension and steering, I would not want to be doing 140 in a 66 mustang. That thing would be floating around the road like a "Terd in a punch bowl"
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'66 Ragtop, vibrant red, 289-4V, 4-speed toploader
'68 Fastback, space blue metalic, 351C-4-V, 4-speed toploader
top end of an A code mustang 
