Run a non ho roller efi?

[oldiron]

As I'm digging deeper into the efi swap for the '77 (Mustang SD EFI). I've had an idea. The '77 is running an '86 ho roller, so has the ho/351 firing order, everything should match up nicely and run great. BUUUT in my '72 I'm running a '68 302 with the old non ho firing order. It has been my understanding that you could run sefi on this engine and it would run fine but could have a small idle problem due to the different firing order. COULD I use the harness and ecm from say an '88 crown vic/grand marquis that used the old firing order? So far I haven't found a reason why it wouldn't work just fine. I did an inventory yesterday and I believe all I'm missing is the ecm for the swap.
BTW the '77 efi swap hasn't been nearly as hard as I thought it would be so far.
Greg

 

[needsmoarturbo]

If I I recall from the depths of my memory correctly you don't even have to swap harness, the injectors are wired off the same pins. So you just need a non mass air ho computer. And if you do want mass air you need a mass air computer and can just add the mass air wires to the harness.

I looked into this long ago and put 19lb injectors and a non mass air computer onto my old 302 engine firing order. It idled fine even with the wrong injector firing order but had no more power than before so I think I went back to the LTD computer and injectors..

Edit:
Duh I guess I didn't fully understand your question at first. Yes you can 100% put an 87 crown vic efi setup on an older 302. That's what I'd did put it on my 74 bronco engine, it runs great.

 

[oldiron]

Well good; at least I had my mind right this time. After I finish the '77 I'll start on the '72. Can't wait.
Thanks
Greg