spec. listed in my rebuid kit text shows 29/64" DRY, both pri. and sec. for '65 390 A/T. I always set it WET, per the shop manual, @ 29/32". Accel. pump lever is inside and #3. The plastic secondary arm has a "tit", which fits into the diaphram's hole, as opposed to the metal arm's hole, and the arm's pivot hole is also different between metal and plastic. If you must use the metal one, you will have to do some fabricating.
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HAVE A NICE DAY!!!!