ignition

Im looking into an msd ignition like this one http://www.msdignition.com/ignition_4_6200.htm
I hear so much about them but have one question, where does it install. I have a 86 irocz 5.0 and my engine does not have one of these that is visible. Where does it mount?

yes this is probably a lame question but i am new to the car building world.

a 6a or 6al will come with its own box you can put it where ever you want any thing else will be stock replacement(i.e. coil wires distributor)