Quote from 66gtk715 is too much carb, even with a high rise manifold. Try a 600 CFM carb with a stock HiPo.
this is the conventional wisdom, especially with the stock iron manifold. However, I use the 715 w/ the vintage Shelby aluminum manifold with very good results. Engine has stock internals with the exception of roller rocker arms. When I had the carb restored (by Pony Carbs) several years ago, I did ask them to do what they could to reduce or eliminate the hesitation off idle. I don't know exactly what they did, but the result was phenomenal.
I used an Autolite Hi-Po carb for several years on the same engine with predictable results. The Autolite carb worked better off idle, but not by much, while the Holley carb was far superior above 4000 rpm. A night and day type difference. We all know the kick of the Hi-Po cam above 3500 rpm, the bigger carb takes advantage of the Hi-Po cam very well. So I have to conclude that the Holley 715, with the right adjustments and manifold, will work on any Hi-Po 289 without problems.
Z. Ray