Big block with low power in the lower speed range

Hello Loide, I’m new here and have a little problem with my 440 magnum. Maybe you can help me. The maschiene doesn’t pull at all in the lower speed range (300 – 2000 rpm), or the engine almost sucks off when starting or with strong acceleration from the lower speed range and stutters if, for example, I don’t bring it to over 2500 rpm when starting at the traffic light. The same picture arises when accelerating from about 60kmh in 4 gear (4-speed manual): the maschiene krie If there is a full power drop (this doesn’t happen during gentle acceleration), the big block runs in idle mode at 300 rpm and is also running round (hot nock??). It is still striking that this power drop occurs only under medium to heavy load, i.e. if I turn up the machia in idle mode or very gently accelerate, it runs perfectly and there is no power drop. In order to fix the problem, the ignition was completely re-set 3 months ago, Zündk and the compression is measured (compression was very different per cylinder, but in the tolerance range specified by Dodge in the service manual). Now my question is to you: what can this be? Is the carburettor the problem? Do the intake spider, cam and carburettor may not fit together? How can I find this without taking the whole engine apart? Thx for your help!