Clutch delay valve? I know of orifices, but not actual valves for a T56?
I am putting a needle valve in the hose that runs between the clutch master and slave cylinder that is engaged by a solenoid valve and controlled by the shifter being in 1st gear.
Basically if the car is in 1st gear it energizes a solenoid which reroutes the pressure from the master cylinder through a needle valve.
Plan is to light the second bulb at the track and put the car in 1st gear thus rerouting flow. When it turns green, side step clutch pedal. I have a lowdoller 400psi pressure transducer wired into the stock PCM that HPtuners is logging clutch pressure. If I bog the engine or spin tires I can slow down the clutch clamping time by restricting flow on the needle valve. I can measure that with the sensor, so lets say it takes 0.4 seconds for the clutch to fully lock and it bogs, I can dial the valve in so it takes 0.6 seconds. That way I can dial in a consistent, repeatable amount of time per a specific HP and track 'stickiness'.
Once I am out of 1st gear the valve will open back to unrestricted flow and the clutch will clamp as fast as I can get my foot off the clutch and the springs overtake the inertia of the clutch.
Basically it's a fancy version of the people that used to bolt screen door closers to clutch pedals to slow the clutch grab down on older stick cars and a more instrumented version of a product that is sold which I am improving on because well, those 6 damn years of engineering classes have broke me and I refuse to accept 90% of aftermarket components because I find obvious design errors and decide I can improve on them.
I have an 8.5 with 7.5 axle tubes so if you have a stock 7.5 or 8.5 this is roughly where you will be since all my geometry is near to factory as you can really do. 
