Re: '66 Project in Texas
Welcome from Denton!
I'm pretty sure your transmission would be the SM420, but since you say it isn't original it might be the later SM465.
Here's some pages to get you started on the tranny ID:
http://www.novak-adapt.com/knowledge/sm420.htm
http://www.novak-adapt.com/knowledge/sm465.htm
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Andrew '69 C-20(292, 4-speed) Retired Daily Driver
'64 C-10(250, 3-speed) Fixerupper
'97 F*rd Mustang GT(4.6L, 5-speed) Daily Driver If I only wanted two pedals I'd have bought a bicycle. 
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