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OK, well i've never had to deal with an issue like this before, so i'd like some ideas here.

Here's the issue, 69 charger r/t with a 440/727/8 3/4 with 3.23's, all stock motor except for mopar ele ignition, eddy CH4B intake, and eddy 1411 750 carb. when i floor it in, on the down shift it pulls hard to about 3600rpm, and then all of a sudden looses power, and almost stumbles/flutters without making power. Sometimes it does it, and sometimes not. It's really hard to describe it, but it's just like someone pulled a plug out while it was running, kinda missing and not making power. Not at insane high rpms, just on lets say a 40mph kickdown, then all of a sudden it just boggs.

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What are you running for ignition? Orange box?
What kind of fuel pump?
Sounds to me like it could be either weak spark or weak fuel pressure.