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71 Pantera spark comes and goes?

I am working on a 71 Pantera,this car is new to me, and my problem is irregular spark, this is whats happening: car has been sitting for a number of years for starters, I have a new carb, installed and electronic distributor, new solenoid. used, but good, 825 cca battery. I have gotten the car to fire and run on what sounds like all 8 cyl. but it will only run 15 to 20 seconds then it dies, I installed a spark tester, where I can monitor the spark, after a 10 or 15 min. wait I can restart with strong spark, it runs 15 to 20 seconds then it dies, what I have noticed is when it dies its because it has no spark, if I try to start it immediately it has no spark, but after waiting 10 to 15 min. it will start but do the short run thing...I am lost on this.One other item of note is the carb has an electric choke that I have wired in at the power panel , but not at the coil, I used a key on 12v. supply, can I use power from the oil pressure sending unit? Any help is appreciated
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