67 w/ Holly, still stalls out

[Greg_Graham@xxxxxxxx]

Last week I posted that the '67 would run fine for 2 minutes and then stall
out, as if it were experiencing fuel starvation.  The car has a new tank,
new metal lines, a new pump, a new filter, and new lines from the pump to
the carb.  I pulled the Holley carb and found that the previous owner had
rebuilt the carb quite recently, most of the gaskets, etc looked brand new.
I haven't put many miles on the car at all.  I did find that the primary
float was out of adjustment and, when in the "full up" position, was
completely cutting off the fuel to that float bowl.  It could have been
that the float was sticking in that position even when the fuel level went
down.  I adjusted the float and made sure that it still allowed just a bit
of fuel, even in the "full up" position.  I still have exactly the same
problem.  The car runs fine for 2 minutes or so, then I can hear the engine
rpm drop ever so slightly, as if it had reached normal operating
conditions, then the car will stall out and die within 5 seconds.  When I
pulled the carb again, I found that the same primary chamber still had very
little fuel in it, although it is now impossible for the flow of fuel to
that chamber to be cut off completely.  I've checked the lines, and a
mouthful of fuel suggests that
there are no obstructions.  The secondary float bowl is full of gas.  Could
it be that I have missed something?  The interior of the carb is scrubbed
clean.  Could it be electrical.... like the coil gets warmed up after 2
minutes and then fails?  Any suggestions would be appreciated.  Thanks,
Greg