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The September 2020 issue of Hot Rod magazine has tech article about swapping in a later 5.0 motor into your early 'stang. Almost everything is covered like the two different firing orders, what to ground in the wiring, the smog stuff, the o2 sensors, the fuel system, and, in general, advice on how to do this and keep it trouble free.
So, when the Sept. mag is o longer available, you can also probably find it at HotRod.com.

No, I am not an employee of the Ten network.
You are welcome.
 

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Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
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Err, what? Is the article about the 5.0 that went out of production like 20 years ago? Or "late model" Coyote 5.0 transplants? (Hot Rod is still in print?)
 

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It's in the JULY 24, 2020 issue, and is the old EFI 5.0.
"What Common Mistakes are Made Swapping a Ford 5.0L Fuel-Injected Windsor V8 into Older Ford Muscle Cars?"
Here's the link to the preview: Read What Common Mistakes are Made Swapping a Ford 5.0L Fuel-Injected Windsor V8 into Older Ford Muscle Cars? Online

It also makes reference to a related article from 2015 ("...There are at least 25 mistakes or fallacies commonly made when retrofitting mid-’80s to mid-’90s Ford 302 EFI V8 engines into earlier Ford muscle cars, including “wives’ tales” that some think are mistakes but really aren’t. For a real-world fix-it on a 5.0L-HO Ford SFI engine swap into a ’77 Mustang with many of the errors discussed here, see our online article from 2015: “HOT ROD to the Rescue—This Late-Model 5.0L SFI System Runs Terribly.”
 

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Just some guy
67 coupe, 69 Sportsroof, 86 hatchback
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Ah. So tips on how to swap a 20-30 year old Windsor into where a 30-50 year old Windsor was then. Not exactly breaking news, but OK.
 
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Ah. So tips on how to swap a 20-30 year old Windsor into where a 30-50 year old Windsor was then. Not exactly breaking news, but OK.
Yep -- that's the bane of every Lump conversion. When you put in a newer engine, it gets outdated within a few years by the next better-performing engine, and you end up having a non-original dog.
I struggle with that all the time -- it turns out, keep original as much as possible, unless you are seriously competing, or need a reliable daily driver.
 

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I think the Edelbrock Pro-Flow 4 setup is about perfect. Multi-port sequential fuel injection for dummies. It has been 100% flawless other than liking a throttle cable over throttle linkage. Perfect now! No combover, stock export brace no problem, and the straight Monte Carlo works with a tweak. Time has marched on!
 
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