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Fe ford engines have a bad problem of crossfiring if the plug wires aren't routed correctly---
Which two cylinders are miss firing????
Switch the position of the carbs and see if the condition changes cylinders---
Have you done leak down/compression checks????
Checked timing with a lite for every cylinder???
Checked cam / valve lift and timing for bad cylinders??
You have not given any facts about what has been done to identify which carb or cylinders are bad
PM me with this info and I'll try to assist you with solving your problem
Jerry
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