I will be putting EFI on another vehicle in a month or two.

Should I start with $OD or $OE in my 16197427 ECM? I'm starting from scratch and will be using a Chevy 350 TBI, sitting it on top of an AMC 360 (later a 401).

I will be using the ECM's timing control, but not the knock sensor or EGR. No computer controlled transmission in my future, either.

Is there any significant difference between the two? Is one more popular than the other?

Thanks!