Hi everyone. My son is just about completing a frame off restoration on a 1978 TransAm. The car has an original factory 403 Olds engine which he sent out mid-west to have rebuilt. It has a Holley 650 vacuum secondary's carb. I've helped him some with the motor and we fine tuned it. It ran and sounded good last time I was at his house. He tells me last week he started the motor and it would run for 2 minutes or less, and then die out. Something definitely happened between my last visit and then. He's tried a few different things such as leaving the gas cap off, which he said isn't vented, changed out the fuel pump and tried a gravity feed into the carb. with something he rigged up. Said nothing helped. The tank, sending unit and lines are all new. The fuel pump produced fuel, but it wasn't coming out under a lot of pressure. The spark plugs were also slightly black. I thought it might be a vacuum leak problem and he checked all the hoses, which were on the correct ports and fine; not cracked. The carb. is new and he is having it checked out this week. Any idea what the problem might be?? Something we could look at?? Try?? He tells me it seems like it runs out of fuel. He does have a full tank. Many thanks, Carmine.