MSD problem

[Macbuick]

Hello,
I have no spark on my plugs with the following MSD parts:
6AL 6420 + BTM 8762 + Distributor 8548.
Engine is 350ci Buick with Procharger.

I checked if there was spark on the coil by grounding the white wire from the 6AL and it works, I have a spark (https://www.youtube.com/watch?feature...&v=8Qb9JxX-mLg)

, I checked the resistance on the magnetic pick up, I read 590ohms. (http://www.msdignition.com/page.aspx?id=3304)

But engine still won't start nor show signs of ignition...
What else can I check?

Thanks
David