Hey Miget,
I have a 950 QF HP that I replaced Holley with. I like the secondary adjustments, float windows, the jet configuration, etc... it works well & is very resonsive. Simply put: I gave it less pedal & got more results than the prior Holley DP. It came stcok w/ jet extensions & blocked PV in the secondaries. Everything is so ajustable with more ease... even the needle & seat. Anyways, I am not a carb expert by any means, but it does the basics well & is way more adjustable.