Edelbrock mid throttle problem

Many years ago I had a similar built 440 (.030 with MP 280-.474 cam,headers,performer rpm intake)with the eddie carb and we tuned it to death.I thought it ran pretty good.Took it to the track and ran it.Swapped on a box stock Holley 750 vacuum secondary with no tuning and went .20 quicker in the eighth mile.
Not bashing edelbrock so much as that was the turning point for me.I sold that edelbrock and haven't owned one since.
They are fine for cruising and start nice with an electric choke but for max performance a Holley always works better for me.

EDIT:
10.4-1 and 37 degrees total advance with iron heads seems kinda high to me unless you have a fresh air intake and some really good gas.Are you getting any detonation?