['68OrangeSunshine]

Another '67 MY quirk: Don't freak when you turn the light switch on and the Parking Lights go out when the Headlights come up. That's normal for this model year. They will still blink as turn signals.
A lot of Federal safety changes [including side markers] were mandated in 1968.

I had to cut a hole in the cowl for the AM/FM antenna on my '67 K/10 Suburban. No factory radio.
To not interfere with the CB whip * on the passenger side; I put it on the drivers side. PO had put in an Alpine cassette/receiver deck but had a loose stick antenna on the dash.
[* Yes., it was a long time ago.]