Basstrix,
Can't comment on the Pertroxix 600, but I have the model 510, which can be had for $217 and has much more features.
rev limiter, multi-spark, will drive a shift light, 2 step, adjustable start retard, just too mention a few.
I am running mine with a MSD distributor.
Iam certain that it will work with a Duraspark distributor but don't know about using one with an optical sensor type distributor.
yes, there are lots of wires to run and lots of dip switches to set, but mine has been flawless for about 4 years now.
this unit also does a tach sweep for rev limit and 2 step limit.
Guesing you already have a non factory tach ?.
Boilermaster