Square wave ingition triggers

[Bruce Plecan]

From: Thomas Matthews <Tmatthe1 at worldnet.att.net>
To: DIY-EFI <diy_efi at efi332.eng.ohio-state.edu>
Subject: Square wave ingition triggers
>Does the MSD distributor put out a square wave trigger pulse that is
>compatible with GM modules and EFI? The MSD distributors look like
>they use a Ford type pickup assembly if that helps..
>TIA,
>Tom

What for module do they use?..  What distributor part no.?.
Cheers
Bruce