Nice info. Glad I did the memcal and resistor mods when I did my conversion.

The resistor mods change the way it fires the injectors.
Copied and pasted from the tbi to mpfi zip file:
"Next you will need to change two resisters in the PCM. This modification is necessary to...

From what I understand, installing the jumpers changes the way the ecm fuels the engine, so I would say that yes, it will effect the fuel tables and require them to be re tuned.
Installing the...

This thread, post number 6, is the instructions I followed when I converted my 7427 to mpfi. http://www.gearhead-efi.com/Fuel-Injection/showthread.php?303-16197427-PCM-Information-0D
I did the...

I didnt even think about that. You did do all the required mods to run MPFI right?

Have you adjusted the injector offset Vs battery voltage? Since you have installed MPFI injectors, this needs to be changed to match the new injectors as it can have a big effect on how it runs. Are...