I have such story , maybe it have some hint for you .
Once I was dissasamble the Air Mixture for cleaning , I literly dissamble into the every single piece of components . then I vapor blasted , porting the Air Mixture inside casting mark, wildend the intake . after all the work , I put it back and the car wont start. as it will stall after 1 secound of running .

the result was been the hight of the Air mixture bun need to be adjust few turn , because the new Oring sandwich between fuel distubutor and the AirMixture also the pressure plate was moved abit with less tight play in the Air mixture unit , the result is a very off chart A/F that result car will not countiune to run correctly .

Assume the Eletrical are all correct and the Vaccume are correct. then it might just be the AF is off the scale