After you do the headgasket ,What about changing the header design?
When I did my 3.4 swap I noticed the headers on the 3.0
Have a horrible design, one header flows into the other head and then the exhaust is pushed out the bottom of the "collector header" thus creating a hot cylinder where the exhaust gases are flowing against themselves
Try getting an after aftermarket set of headers or build your own collector pipe out of some mandrel bends
My 3.4 swap thread
http://m.yotatech.com/showthread.php?t=268301
