Since I got code 53 along with 11, does that mean that even after I find out the problem with my timing belt, that I will have to replace the PCM? In the codes explaination page, "replace PCM" is the only solution listed. Also, does anyone know, if I have bent valves from the timing belt jumping, can I just swap in a head from another 420a? Do I have to get anything done to the head or my block to make this a viable solution? Also, if this is possible, can I re-use the MLS headgasket that was put on my car about 3000 miles ago? Thanks for any info.

Matt