273, or 318?

Seriously? Engine swap? I believe the OP said he was modding a '67 Dart 273-4. Who molests a factory 273 Charger or Commando car? Are you insane? Production numbers gurus chime in. Must be fifty to one 318s vs. Hipo 273s VINs. Stick with the money not 0-60. Wanna go real fast? '66 Nova SS 327 L79. I think these were running 13's in the qtr. stock. I better put my hat on!
My Dad had a cousin that ordered a 65 Chevy 2. He ordered chrome trim delete, so just the bumpers and door handles had chrome. This was back when you could sit with the salesman and check boxes. The L79 was not on the option list, but he got it written in. After the factory rejected it 4 times, they finally built it. Came with wheels that looked like those on a 6 cylinder car, just wider, and the little hub caps. Only give away was the dual exhaust. A real sleeper.