I went with the Rev limiter just for the times at autox when I don't look down. Every once in awhile you try to squeeze a few more RPM out of the motor and the MSD Pill politely lets you know that you are trying to go too far. It was worth the $40 in my opinion. Especially if you ever want to add it on at a later date...that is about $125 upgrade. I have the Pertronix, MSD 6AL, Blaster 2 coil (although the completely potted off road is probably better), and MSD 8.5mm wires. If you send them an email, MSD will send you a set of their special plug hole covers. On DD's recommendation I stepped down to copper bosch plugs. I always ran Platinum but these copper's seem to be doing okay...I think you could put AC Delco's in with an MSD and they would do okay.