Usually when cold the the 1/4 inch sounds about right. Both choke adjustments are made simply by bending the actuating rod. Take two pair of pliers and straighten or put more bend in the rods to get the opening, with the pull off, and the time of choke operation from the bimetal spring on the intake. Note, that the intake must have the heat passages open and it helps some, not totally necessary, to have the heat riser in the passenger side exhaust pipe at the manifold.
(I'm assuming a Quadrajet? If this is a Holley it may still work the same, haven't seen one in quite a while, but I think they are similiar in this regard)
[This message has been edited by tom3 (edited 06-20-2000).]