As described - fuel issue, not electrical.
That car probably has a Webber DGAV. While the symptoms are not exactly right, a good starting point would be to blow every hole out with an air line. I was lucky years ago when mine acted up as I worked somewhere with an air line. Took carb off and with the air line, blew every passage out. Fixed the problem.
Is your the model with an automatic choke? The one I had was a DGV (yes, the A does stand for automatic) and the automated choke was not the best, although Fords attempt on the VV carb was utterly hopeless and many people at the time used to fit Webbers as they were so much better.
