I believe you need to switch carbs with the rod and plunger. On the rear carb, the plunger can, and did, separate from the rod at WOT and catch on the intake riser. NOT GOOD!! With the plunger on the rear carb, it is to long to catch and will just slide across the riser. Hope this makes sense!!!
When you are checking it out, you can separate the two and let them drop down at simulated WOT. You will see which way their might be a problem.
"Bill"!
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