Not Ranked
VC455,
If your car actually was built in 79-80, it's an Arntz. Butler may have supplied some parts or done some labor but it won't be a Butler and won't have the BRI number stamped on the frame behind the left front bumper bracket. Butler didn't build his frame jig until 82. Pictures from underneath are the most helpful in determining what you have, especially of the pedal box area, crossmember and differential mounting area. Door hinge and engine compartment construction will help as well.
Jason
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