Nor is it brain surgery. Crack the 15 yo Ford ecm and clean the epoxy off the contacts and it is ready for the interface with the computer. Not that you would need it for 425 hp. An Obd 1 or 2 reader isn't expensive as a tool in the shop. Probably a lot less than some of the computers in question.

Only problem with EFI and some cam selections is idle quality and that can be solved with a hotrodder work around add on to the IAC servo base. If I decide on more power then I need to recalibrate the MAF sensor and plug in bigger injectors with an adjustable fuel pressure regulator. Next bump would include a bigger fuel pump, higher rated press reg, bigger injectors and new plumbing for the fuel lines as the stockers won't handle the pressure.

Were I rodding a mod motor, I might consider that ecm although they will put out incredible hp with a stand alone dis and a sheet metal intake with a 750+ carb.