Have a 1982 200 Ford inline 6, It idles perfect And quiet, when you accelerate it gets a good amount of power for about a second then?

Starts losing power, if you floor it, it will die. Starts losing most power at half throttle after that it starts to hesitate. Has a new carburetor, timing is good, advancer working, new spark plugs, fuel pump, filter, pcv valve, vaccum lines good,

Added (1). Ah I forgot to mention it runs better with the choke about 3/4 closed, no diaphragm for pump. It has original electronic ignition.

I'd guess somethings up with the carb. Be sure the choke is right ect.

With it running better with the choke 3/4/ closed, its starving for gas. I think i would take that new carb. Back and get another one.

Sounds like an accelerator pump issue to me - with the engine off remove the air filter and pump the throttle while looking into the carb - you should see a couple of big squirts of fuel every time the accelerator is actuated quickly.

EDIT with you update it sounds more like a vacuum leak or too small main jets installed.

The float is misadjusted and won't drop far enough to allow enough fuel into the bowl. You get good initial power until it runs low.
Check the entire fuel line for dents and don't forget the fuel pickup sock in the gas tank.

Check for spark with a spark KV meter. Engine is likely running lean. Suspect a bad accelerator pump, bad power valve, wrong size jets or bad float setting.

Is this the initial problem you were trying to fix, or happened after you replaced the new parts? If the initial problem, then it's most likely something you haven't looked for yet. Like, a kinked fuel line or a restricted screen in the fuel pickup. If this is a new problem since the new stuff was put on, then everything new is suspect.