Correct, relatively new (about 1.5 years old) Holley 600 w/vacuum secondaries. No adjustment possible on floats, needle or seat. has air/fuel mixture adjustment.
Has the provision for the ford kickdown (which I just found out in another thread where I asked what the lever besides the throttle was for).
Put the Holley work on hold until I get the 2500 stall 10" converter (current was 1500) in early next week. That should help with my stall problems (as noted by F-bird'88 in my other tread on the distributor).