Okay, guys... here's the deal: My buddy has a very nicely restored 1970 Road Runner, 440-6bbl, 4spd, all done to stock trim and specifications. (original dual point distributor and everything)

It just recently starting "acting up" whereas the car suddenly dies. It could be idling at a stoplight, driving down the road at 40mph, doesn't matter. The car will suddenly and inexplicably konk out and cease to run. When this occurs, the car still has electrical power. Such that, the starter will crank, the lights continue to be lit, horn works, etc.

When you try to restart it, it will catch and sometimes it'll run for 5 minutes...maybe 5 hours...maybe only 5 seconds before it quits again. It's as though someone has turned off a lightswitch on the ignition and it's done. We've checked the spark, and it has it. We double checked the fuel (even thought it isn't puttering out like it's running out of gas), and gas is flowing freely in the center carb when you pump it. It's just totally random and intermittent.

We've replaced the ballast resistor a few times (with both new and used pieces), checked all the wiring (brand new harnesses everywhere), checked all the connections on the wires including at the bulkhead connector, even swapped out the condensor on the distrib with a new piece. Nothing is affecting the random shut downs.

We're at a loss. I'm sure we're looking right past whatever the problem is... hiding in plain sight right in front of us, but we don't know what it could be.

Suggestions?... please?

Thanks in advance!