Intermittent engine miss

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My 84 has an intermittent miss. I have changed
plugs, coil & coil pack, & plug wires. I am running
an LT 1 MAF with a Translator (old one). It used to run
fine with the same MAF & Translator. I am out of ideas!
I did a search & this seems to be somewhat common problem,
but few solutions posted. Any ideas? TIA

 

[TurboBuRick]

When does it miss? Under boost?

 

[6 to go]

No, it seems to pull OK, but then again, its hard to run long
WOT on the street, so I can't really say for sure.
I am running an 87 ecm too, btw.