Help!
I have a 302 bored .060 over.
Mild cam
Edelbrock intake
Edelbrock 650 CFM 4 barrel carb
Headers
MSD 6ALN box
Automatic
79 F100

Was getting on the highway and had it to the floor, went through all the gears fine, when I reached about 65 it was like someone turned the switch off. It came back, pulled a little bit and did it again. I let off the throttle a little and then floored it again, same thing. If I am not all the way into the carb the engine pulls fine, seems that the problem is only when I am in WOT.

If I shift to first and floor from a dead stop it it pulls like crazy all the way up till the MSD kicks in and starts dropping cylinders like it is suppose to.

What is causing this???????