I have a stocker 67. It is a Malibu sport coupe with a 250 Powerglide, manual steering & brakes. I can believe what he says about economy. Still a 194 though, is a little too weak. I'm sure it's smooth and quiet. A 230 or 250 have no trouble keeping up with traffic, that is until you get above 70 mph. I also love seeing old Chevelles running totally stock equipment once in a while. Many old granny cars wind up with lots of engine and chassis upgrades and are pretty cool.
If you have it, it doesn't matter.
If you don't have it, it doesn't matter.