You would have some missing headbolts.

There was a guy on another board claiming to have 3.4 heads on a 3.0 and after going out to the shop and looking I thought to myself BS. After staring at this crap and thinking maybe there was a year change I called in the Toyota gurus.

Tim at DOA racing said noway because of headbolts and valve timing, John at LCE said the samething, and Ted at enginebldr sent me a very colorfull and detailed email confirming what the other guys had said.