E58 400 plus HP Dart sport build

Should do fine with that ignition. My cam punks out at about 5500 and I have the rev limiter set to 5k for street driving.

You might wanna have your local transmission shop spec in a new converter for ya with that setup... likely need a bit more stall than stock with that cam.
727 actually going to shop for a full rebuild and will get a bigger stall. Not sure 2500 is right few people could not a tell difference with them claims a 2800 is needed. Range is 2500 to 6400 so matched well with some luck. I plan to drive to work whopping 5 miles one way. Other than Owasso drag strip and highway won't see much highspeed weekly.