How do I connect this gas pedal?

I know some early-a slant six cars with AC came with a V8 throttle pedal and bracket assembly like the one pictured, but your pictures it’s hard to see the part that bolts to the firewall, doesn’t look right to me. Has the bracket been modified it is it a newer pedal assembly? Your pedal is correct for slant six cars...but won’t work with the other stuff you have....and not sure about that hole an early-a car never had that

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