My uncle had a '67 or '68 Camaro, and I could swear it had a 3 on the floor.
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FU FiAT1!!
Are The Good Times Really Over - Merle Haggard
ESAD feeYoT!!
You are not mistaken about the three-on-the-floor. I remember those.
Standard models around then had three-on-the-tree, but floor-mounted was an option.