I have one on my 69 GTX, working with a 6al MSD box.
Ran it this summer, but I have the no vac advance version and I tore it apart, did some machining and epoxy to lock it at 38*.
So far seem to run fine.
I had the MSD distributer, but it was too tall and I could not fit my (N96) air box on and close the hood. The 440 Source Dist is much shorter, thats why I went with it!
Ed