Ok on the 7448, we're intimately familiar with those around here!
For folks who have never delt with a manual choke system on a vehicle before, there is a learning curve on just how "much" choke is needed to both start the engine (even when warm) and how to set up the fast idle side of the equation which must be a part of the choke operational scheme!
It would be nice to say that all these new 2300 carbs had the fast idle set and coordinated with the choke actuator when they were assembled...in a perfect world...maybe. But in actuality, hardly ever! And that is part of the setup stuff we do here when we sell these carbs ourselves, we make sure the setup on 'em (even those we convert to electric choke) is done right.
So...first off, "adjust" your choke cable so that you cannot fully close the choke plate down tight! An automatic choke on these carbs of any design includes a "choke break" that allows the choke plate to be cracked open when the throttle pedal is pushed wide open to overcome any "flooding" which occurred due to other engine issues or incorrect choke application. But your setup does not allow that function, so ya have to learn how not to flood the engine from too much choke! You are right, you will just have to fine-tune the cold starting drill once the mechanical adjustments are locked in.
Set the cable so that when pulled "out", it allows about 1/4" of "opening" of the choke plate away from the air horn, that way, air can enter the carb and prevent a flood condition. Do not allow the choke plate to fully close. On the other hand, when the cable is pushed in, make certain the choke plate goes tight against it's stop and is wide open.
Once the cable is adjusted, then set the fast idle screw on the passenger side of the carb to provide a fast idle rpm of about 1400>1600rpm at that point. For the choke system to operate correctly it must be coordinated with the fast idle setting...otherwise, the only way to provide fast idle is with your foot and that is not how these mixers are designed to operate! But then you have already discovered that!
That fast idle adjustment screw can be a real bitch to access. On some applications the carb must be removed in order to tweek it!
If the accel distributor is the normal aftermarket unit, it does not have the "dual diaphragm" advance can like some of the oem stuff did with the "two stage" or dual vacuum advance. That can needs to plug into the vacuum port on the side of the 2300 metering block as that is the only "ported" vacuum source on that carb. On most rigs with a curb idle of around 700rpm, you will see between 0 >3"hg at that port, with vacuum increasing in direct proportion to throttle plate angle. With the cam you describe, I agree that your curb idle will have to be determined through experimentation, so rig a vacuum gauge on the advance nipple and verify the vacuum levels you see at curb idle and as the throttle plate angle is slowly steepened. The vacuum increase should be linear and not take a big jump.
The "ported" vacuum level is also affected by whether or not the choke is engaged along with fast idle, with the choke "on", vacuum will increase, so when the choke is on, the vacuum readings mean nothing.
Also...I'd set the idle mix screws at 2.5 turns out from seat now, that is a starting point, once the motor is up to temp, then those can be finalized.
Be patient, you will be very pleased with the results once all the details are taken care of, I know the marketing hype talks about "drop-in replacement...but that is total smokeblow, every swaperoo like this has it's own set of unique details to attend to!