Thanks Zippy.
I am actually going to use the TFI coil with a MSD street fire. If that eventually fails, I'll do the HEI thing. When I was looking into the HEI option before buying the MSD street fire, I got the impression that there's a lot of junk HEI modules out there at parts stores. Didn't make me feel like it would be a reliable upgrade, though it's probably just perception. There are also people that say MSD is junk, but I've had good luck with them.
I have also read the people at Tech West racing, who modify MSD boxes, that they specifically recommend the Autozone Duralast C839 for MSD 6al (and I think other MSD models too, just not the 7 series).
http://classracer.com/classforum/showthread.php?t=36302&page=2The thread seems weird, like it's missing messages, but there's some stuff there.
