471 Big Block high rpm problems

mguner said

If all that check out we are back to rotor indexing in the cap. Quick check would be to swap distributors.....

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Would be great to swap stuff but I am in Poland where car like mine is more exotic than Lamborghini... ;-)
I also have stock Mopar dist + chrome box + balast resistor.
Will try this setup probably next weekend if there is no progress.