Man, a carbed engine? What a joke.
Hilarious. First, thats going backwards. You've limited yourself with tuning.
Second, you said you essentially wanted a street able car. With a build like this, there is zero way to make this function as a unit if getting rid of the EFI system.
How are you going to feed it fuel? The stock setup is already underpowered as it is. Oh gut the fuel system? Well whats controlling the PWM driver module?
This whole idea has gone from "hey pretty cool" to "clown show" pretty rapidly.
The level of fabrication required can't be done using your $35 Harbor Freight Pittsburg MIG welder.
You clearly have ZERO clue what you're talking about, much less what you're doing and it's obvious you're just a tire kicker here to stir the *** and be a troll.
What you're talking about doing will take you AT LEAST 20 to 30K and that's WITH you doing the work (which you can't do). The research and adapting you're going to have to do is astronomical and will likely net you no gains. The 347 you're talking about is heavy.
You'd be better off doing a Coyote, or h-e-l-l, even an LS swap. It isn't impossible. But I showed you the link to TOOKOFFs channel and what's required for his LS swap. And he does mostof the work himself....you are NO tookoff.
What's your background? What level of fabrication skills do you have? You are asking about "rear diff width", which tells me you are asking all the wrong questions. And not even asking it right. You mean the rear differential? Well that thing is only about 8" across. Or did you meant the distance between the rear axles? Smdh....amateur hour.
Kind of annoying when teenage tire kickers come on here swearing they can do something when they clearly have no idea what they are talking about or doing.
I don't mind a thought experiment and discussion on the merits of something like this, but to come on here saying what you're saying...smh...crazy.