Be careful of the rev limiter in the Crane units...I know a couple of folks that have had issues with it kicking in sporadically. As for the Pertronix, they're good when they work...but I've been stranded several times in a couple different cars and eventually took it out.
Sammy, you'll be glad to know, a certain Pure Stocker tested a Pertronix versus points system...the points made more power!