Hey there! Finally remembered to ask the hubs about that engine. He says it’s from a 67, and just a regular 4 barrel carb, no high octane.
Ah, ‘67 was a very good year to be a Dart. Improved brakes, no emissions/safety crap. The 318 might have been available in that year. Just keep an eye on those ball joints! Nothing regular about a 4 barrel carb. I was satisfied with my 1 barrel Holley.