Does the 747 a take-off warning (like the A320) if power levers are advanced with stab trim outside of acceptable range?/QUOTE]
On standard 747-400's, it depends on what data the pilots enter into the FMC (as per their loadsheets): Weight, thrust, CG, etc. i.e. Garbage in, garbage out.
However, prior to this, if the wrong data is entered, there is a chance it could be caught prior to takeoff. The aircraft does a rough check between entered data and the nose gear strut pressure. There is a pressure sensor which sends data to the alerting system. Strut pressure identifies aft or forward CG (roughly). An advisory message is generated if there is large discrepancy.
ALSO, on aircraft fitted with operative Weight & Balance systems (common on Freighters), computed weights and CG are displayed on the CDUs in small font for comparison with manual entries.