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Pull your HEI and bring it to any auto parts pleace as most will test it for free--- at idle, at acceleration, at high speed, etc. Had one where the condenser would crap out--drove me nuts. Also had one where the weights would hit up against the bottom of the rotor and bid off---also drove me nuts. What size wire are you running to the HEI--should be heavier then stock to handle the HEI.
You may want to run the HEI vacuum advance off of the timed vaccum port on the car verses the full manifold vaccum port or vice verse. If the engine has good compression, you've switched carbs, my guess is it's not internal and my $$ bet would be on one of the above. What does a vaccum gauge say at idle?
Good luck
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