technically it's a 400ci for the 67...and that tri-power setup was not factory.
The interesting thing is there was a 421 and 428ci upgrade that was DEALER installed. The 67 I was looking at may not have been all original but had the 428, the hurst dualgate and even that tissue box under the dash.
Back then the dealers had a lot more liberty...but you also didn't have idiots out there doing things wrong and then looking for someone to sue over it.
There was a really low mileage 65 I was looking at too, but it had a blue interior I didn't care for