Hmmm, Qjets are great with their small primaries giving great low throttle response on a small ford motor that does not require much gas and then it's ability to manage those large secondary's with vacuum for howling upper RPMs. I read the throttle shaft and base plate mentioned here and wanted to add the air horns also would bow and cause issues with air leakage. MR Gasket use to make an air horn gasket to rectify this. If you were already set up for the Qjet with fuel line connections, linkage etc. and were happy with it I would give it a freshen up and drive on. I'm assuming you have a square bore intake to spreadbore adapter plate? Gasket good there , too? I have had great luck with them all, currently running and edelbrock with the stabilized off road needle and seats and jetted down to the low fuel requirements of a 289. They usually work good right out of the box and can be modified cheaply to perform better at angles. Holleys have always seemed to make the most power for WOT (WIDE OPEN THROTTLE!!) I have a dual feed vacuum second 750 on a 460 in one of my pickups and LOVE it! Tuned right, runs right cranks with no issue on 10 Degree days and 102 degree days.....I guess I'm really no help!