Fuel filter location?

Valkman said

I watch the video, thanks for posting it, but I my problem is not with the initial throttle, normal driving it's fine it's when get in the into it that it falls flat then picks back in abit but the secondaries nevr seem to kick in. That’s why I was thinking maybe it's get starved for fuel

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Hang on,
The secondaries are coming in too far and too fast. The proof is in what you are feeling. The "falls flat" is the kick in the nuts of secondaries coming in too quick. And the "never seem to kick in" is cuz they're now wide open!
Easy solution just slow 'em down until it stops falling flat.

On the off chance that you have a DP carb, or one way too big for your combo, the above applies to carbs of 650s to 850s, with Vacuum secondaries or Air valve secondaries, like; AVSs,AFBs,TQs, Holleys, and copycats.