4160 Holley help

Auto or manual trans?

These carbs can be upgraded/chnged around quit a bit. You can install a secondary metering block (4150) instead of the plate the 4160's come with. It is more tunable that way, but not a huge deal.
This carb is preety good OOTB as delivered. i would run it as is with just a jetting change (IF NEED BE) and see where the short comings are, if any.