Edelbrock part throttle surge help

You put a cam in it right? and the idle /low speed vacuum dropped right? And the metering rods are held down by vacuum pulling against spring pressure, right?
And the new cam needs a new timing curve.
Well, start with giving the engine the idle timing it wants.This will bring the idle/low speed vacuum up. Perhaps enough to keep the MRpistons down. If not, the answer will probably be in, Post 13.Its a very fine post.
The 268 cam is easy to tune for, so hang in there.
Messing with the float level, I would consider much later in the tuning game. Jumping from 7/32 to 10/32, is a pretty big jump.
Timing is always number 1. Well, actually no 2. First would be mechanical. Making sure the compression is even and adequate, and that the valves are sealing.Especially the intakes.