Can't help with a PCM, but if you choose to go carb or switch to aftermarket efi, we can discuss that.

Don't know if I would ever mess with something like that from the factory for a street/strip application. Factory computers are just that, and they get a little fussy when you mess with them. I would have ditched it entirely for a stand alone set-up as mentioned above. I recently purchased a new unit that could keep you in EFI, but much of the factory sensors would likely have to be changed if they were out of the range of this little units parameters, but I am pretty sure it could be easily adapter to your intake and basic set-up with a little luck. That would get you away from a factor type set-up....