Need a Mopar guru: 273 part-throttle ping driving me crazy!

Your carb is correct '2280 series' for a 66-68 273 so jetting is probably correct but our gas today is just bad. If it is 10-15% ethenol, I bet you are running a little lean.

breather may have a baffle under it, check oil cap. Stamped will look huge, mechanicals look small and skinny.

http://s7d9.scene7.com/is/content/GenuinePartsCompany/1787802pdf?$PDF$