1970 340 dart
Cracked was just havin' a little fun with ya! In all honesty, if you aren't sure what parts went into the the rebuild, 5500 should be safe,6000, maybe. Which purpleshaft cam are you running?
BTW,I noticed you're in London, I've got a bunch of in-laws that live there, and we visit fairly regularly. With any kind of luck, I'll see your sweet looking Dart out and about!