A Q-Jet & a 4-Jet aint the same carb. I've never seen a 283 with a Q-Jet so can't comment. Although I did once have a Holley Spread Bore on one, didn't like it.
And also stay away from the Carter WCFB.
This be what I'm talking about.
http://www.carbkitsource.com/carbs/t.../4G-index.html