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i have 1 holley 9776 carb. mech secondary , designed for a tunnel ram, this carb. looks like new, it is missing the mech. secondary linkage arm, same on thats on mech. secondary carb. priced on ebay less than 10.00. i bought a tunnel ram , and the guy said they were both 600 vacum secondary carbs. well they werent. $135.00 shipped, ill post picture this evening. i live in metro st.louis.