1957 XK140MC Cause of Failure to Launch

Following an earlier thread in which I requested guidance to sort out overheating of my XK140MC OTS, I have now developed a new problem.
After timing, plugs, and carb tuning, the car seems to run nicely at idle and with short bursts of accelerator to ~2000 RPM unloaded. A short test drive to assure that all would be well and to see if the overheating was cured, I endured the shocking embarrassment of dying in traffic less than a quarter mile from my garage. I pushed the car to the side of the road and tried several times to restart. It would start and then immediately die. After 5 minutes of OMG what do I do now, I was able to start the car and very carefully limp back to the garage (low revs in 2nd). I left things overnight and restarted the car this morning. Once at temperature, I increased revs in place and once it hit 2500 rpm it died, precipitously. I am thinking fuel starvation. The pump is new and it activates normally and stops normally after pressurizing the fuel line. Am I correct to be thinking fuel starvation? I have a new filter on the way but is there any other gremlin in this?

Clogged fuel line is the first thing that comes to my mind.

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When resurrecting my E-Type I drove it around on slow secondary roads to make sure everything worked. All seemed fine. Then I took it on the freeway. It soon started bucking and would barely maintain 20 MPH. Not fun. I almost drifted onto an off ramp where I pulled over. After a few blips of the throttle, it seemed to run fine. I then drove it carefully home not exceeding 30 MPH. The culprit was the fuel pump which made all the right noises but could not produce the volume needed to support freeway speeds.

In the standard configuration there are 4 filters.

  1. fuel tank drain plug

  2. inside the fuel pump bottom cover
    LCS Pump

3 & 4. in the banjo bolts on the float bowls

I have had rust sediment that collected down in the tank drain plug and blocked the pickup tube. It never got as far as the plastic inline filter I had rigged up.

I have also found particles that got past all the filters and blocked the drilled passage from the bowl to the carb jet.

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Check if there is still oil in the dashpots from the carbs.

Oh yes, this problem followed a carb turning.