Check Airman,
I had them for the B767-200/300 and B747 Classic, never had one for B744, a short sector was a rarity.
I got them from Boeing by asking, they are proprietary information for customers, that probably explains not being on the net.
As an example (from memory) a 350m flight would be around FL270 for a B767-200 with JT9-7RE, ---- the others were not much different, all below FL300, the level of max TAS for the M/IAS was significant.
Tootle pip!!