First, please understand we only recommend direct fit parts. When you change things like this, other problems occur. The only thing I can think of that "MAY" work is to take the good short block and basically replace everything from the HO engine on to it. However, make sure there are places for all the sensors. Basically, you are only using the block, crank, pistons from the good engine. The heads, sensors, intake, injectors. Must come from the bad engine.
As far as switching the PCM, then you'll end up with electrical problems in other areas.
Saturday, November 20th, 2010 AT 8:01 PM