I have been messing with a pair of HIF4's that we put on my '79 B that recently was put back on the road. My mentors with my car recommended that I go with dual HIF4's, I have a slightly upgraded cam in the engine, all of the pollution control stuff is pretty much off.
The issue is that the car gets around 3500-4000 rpm under load and starts sputtering, and will continue to run, but no power. I have watched your HIF4 videos multiple times, and everything prior to the carbs has been checked and is in order. The needles in the carbs were changed to AAM's, and the original needles were AAU's.
It appears that they are running very lean, because if you slightly move the piston up manually with the screwdriver as you show - the engine will stop. Also when I turn the adjustment screw clockwise to make things more rich the idle seems to drop. I ran out of time on Sunday night, and needed to walk away from the car.
So - should I leave the AAM's or go back to the AAU's, and is that correct that the idle should drop as I make things more rich? Also - how important is fuel pump pressure - I am running a aftermarket pump - I know that we checked the pressure and flow a week or so ago, and it was ok - per my friend JAy - I can not remember exact numbers however.
Sorry for rambling on - I hope that I gave you enough info about the adventure.
Joe Stout
Washington, PA.