holley 4160 help. 600cfm.

Size: That's perfectly fine based on what you've described.
Kick: It's hard to know based on description. There's smooth kick and there hesitate and kick and all sorts of subtlies that I hesitate to diagnose whether its OK or not. But you can do some experimenting. Disconnect the secondaries. Then see what if anything changes. If it still kicks then its the trans kicking down or the PV at a bit too low of an opening point.

If you're really into it, then put it on the chassis dyno or at the drag strip run it on the primaries only. Get the best jetting. Then hook up the secondaries and jet them.

If the secondaries are opening too early, you'll be able to figure that out because it should hesitate or at least build less power until the rpms get higher. This is the advantage of a dyno - you get the datalogs of rpm and lamda (converted to AFR usually) as well as torque and power.

Basically what you have found matches what I have found. Secondaries come in around 3000 rpm, usually higher, on this size engine and carb. Exceptions would be purposely set up mech secondary carbs with 1:1 linkage for some race setups, etc.