I'd have demanded a new 3.4L engine as a 'compensation' for the mismatch -- then settle for a 3.2L.
Seriously, wouldn't hurt to ask for a 4/50 warranty on the new engine. If the engine is still not replaced, inquire how much extra would it cost for a larger engine, then ask them to cover that cost as 'compensation'. The worst you could do is get an emphatic "no" from them.