273 carbs are just under 500 cfm. Forget formulas, an adjustable secondary like an AVS or TQ will also work. I've run a 340 Thermoquad 750 cfm on a 273 Commando and it worked perfectly. All you have to do is adjust the spring loaded secondary air valve.
This car doesn't even have a radio, or window tinting. It has a "W" under the S of UBS - what is that for?
It looks like it has a rectangular driver rear-view mirror? And a passenger mirror? That's not on the tag, unless it's part of the 500 package?
I guess this being a 500, it doesn't...
Greetings, I posted this message yesterday, but it was deleted as I had it in the improper forum location, sorry. I just listed a 1970-1973 C body washer bottle part number 3431154 on Ebay for those in need. It's in nice shape, some typical yellowing, but crack free, was removed from a 71...