Hi, Dave here. Got a fully rebuilt SBC 350 in my hot rod.

-has newish new Edelbrock
-has newish HEI dist.
-newish new shorty plugs
-160lbs every cylinder
-valves well adjusted
-adequately timed

Starts right up but runs poorly, missing on three cylinders: checked with electronic temperature sensor on header tubes.
Spark seems to be getting to all plugs, pulled and observed for spark.

WTF is going on? Totally frustrated by this! Where would you guys go next?

Thanks much for any ideas!!