Engine cutting out???

[jiggityjoe87]

Hey everybody, been a while since my last post but recently i've been experiencing some technical difficulty with my 70' suburban. To give you the brief overview of the powertrain I have a 350/700-R4 the engine has a 1406 edelbrock 600 cfm vac secondary w/ elec choke. I have a HEI ignition in the burb and I have vortec heads as well. The problem at hand seems to happen when I am going up the hill to my house it is about a 10 mile stretch with a pretty constant grade, so I go up the hill at about 1/2 throttle and suddenly it feels like either the engine is not getting the fuel it needs or that the spark lighting the cylinders has dropped to a much less voltage. The engine will be unresponsive and very sluggish. At this point I pull to the side of the road and the engine will idle like normal and I proceed to rev the engine to "clear it's throat" after that I get on the road and it's fine. Now I think of a few different things that could be causing this.

1. Dirt in the carburator that temporarily causes the stalling
2. Ignition module on the HEI. I don't know the symptoms of a failing unit but this is just a guess
3. Fuel Pump can't keep up with the engine at that RPM and drains the fuel bowl causing the engine to stall out

Those are the 3 things I can think of off the top of my head. Any input is greatly appreciated. thanks