Can I tune different Intake lengths with duration on a camshaft?

[PeterVR6]

I am building a VW VR6 Engine - its a narrow 15 degree V6 with one head subsquently the intake lengths within the head are different lengths. I have read that it may be possible compensate for the differenet intake lengths using different amounts of duration and lift.
Is even possible if the firing order is
Long - Long - Long - Short - Short - Short
1 3 5 2 4 6

My questions is where would I start if I were to design a camshaft?

I've measured the lengths of the intake ports and have calculated the port speed at max torque from the factory. Whats the next step?

 

[gsz]

I'm sure that VW has compensated for any runner length variations within the head (intake ports) by varying the lengths of the intake manifold runners accordingly. As far as having a custom cam ground so that the durations/timings match an un-equal length intake, sure it can be done but why? It'd be far easier to just make a proper intake, and besides an odd-ball cammed engine might tune perfectly at a given speed and load, but everywhere else it'd be crappy, especially at idle. IMHO, it's the wrong approach. If you're going to fab a custom intake, just do it right (which btw is no small feat).