Something In my #5 Cylinder?

exactly. You can’t go any faster anyways. So why try and sell you something? Fix the short block then mess with other things. No point in an expensive ignition system right now. I’d spend that money on an AFR gauge.

one suggestion - relying on water/meth can cause problems. There have been blow ups. For whatever reason.
Yep, by the way I already have an AFR gauge.