What amp is the alternator?

1. That is the correct style alternator for '67
2. Not so sure if that is the correct pulley for that application. Look in the service manual, there's a page showing the radiator sizes, fan size, pulley ratios. Depending on what crank pulley was used, the alternator would have had a matching pulley. I think there were only 2 or three differnet pulleys.
3. That alternator has some replacement parts in it. I can say that looking at the rear bearing. Hard to know if the stator and rotor are original to it.
You can look here for the stamped information. This will have the p/n, and assembly date stamped into it. That will tell us what 'rating' the alternator originally had.
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Casting dates are earlier than assembly dates. Each 'shield' has that info as well.
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Testing. Not many places will test it in the manner needed to figure out the Chrysler rating.
Chrysler's specs are to test it for load at 1250 rpm, and 15 Volts. Then see if its in within specs listed in the book. Then you can cross reference the spec with the 'rating'.

Voltage regulator mounts to the firewall.