Deano,
Have to lean towards the ignition system for your problem.
A year or two ago, I had a vapor lock problem. Car ran fine, but then was shut off and parked for about a half hour. Wouldn't restart at all....... checked for fire at plugs... OK. Check for fuel at accelerator pump.... dry to the bone. Took top of carb off and the fuel bowls are dry. Turn over engine with fuel line stuck in a coffee can to catch fuel, and after a few seconds fuel starts squirting out. Put things together and she ran just fine..... and never another hick-up from that day. I was told this was classic vapor lock...... and I could have just ran some cold water over the mechanical pump and fuel line and things would have corrected themselves..... well next time I'll know
