Hi Again,
O.K. I'm running a 428FE with a Mighty Demon 750; CC Cam 292/.560 (244@.50), Edlebrock performer intake and 350:1 gears. My site glasses are set at the very bottom. Any higher and the engine tries to stall from pooling under off-throttle or braking. Mid-site glass settings are a base line and it does not work in all applications especially when you run a radical cam. Make sure you do all of your carb adjustments after the timing is set and you are at operating temperature.
--Mike
P.S. I've got a Carter 130 g.p.h. pump that puts out 5.5 - 6.0 psi at idle. To much pressure or not enough may be something to look into as well.