I found out the hard way that this does not fit a 4300, so beware of this fact. It fits a 4300D for the 351CJ engines as best as I can tell. I had to go to other places to find one for a 4300.
WCCC Response:
All of the 1972-73 factory 4V's or Q code cars had spread bore carburetors (4300-D). 1971 was the last year for the square bore 4V carburetors (4300).