Quote:
Originally Posted by 1967Z28
The holes may be for a NOx smog control box that used to get put on CA cars back in the '70s but those usually got mounted on the firewall.
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I removed this one from a SoCal '67 396 Chevelle decades ago, it was mounted on the firewall. The bolt spread is 2 1/4", other boxes may have had a wider spread??
A cool can would likely have been more horizontally mounted? Fuel pressure regulator?