What does Ed recommend for an intake? For my 427, he recommended a Box R (ported adapter) or a SV. I ordered the Box R but confirmed a firewall issue and didn't feel like cutting/welding the firewall in order to get it to fit (using autofab motor mounts). I finally went to a SV...I should have started with a SV + 90mm elbow.i plan on ordering a new Trickflow upper to go to 90mm. is there a big differenrce between the Box R and the regular R 90mm as for flow? the regular R upper looks smoother and cleaner and cost abit less. but im sure the box R will outflow it pretty good. also worried the box R will hit hit the firewall but i cant really compare it to tell
You're gonna want a good exhaust system...I'd say 1-3/4" primaries will work, but 1-7/8" would be better. 3" Y-pipe into a 4" (maybe bigger?) exhaust, mandrel bent. Ed should give you a recommendation here. I lack a xfer case, so I went dual 1-7/8x3" (wide bolt pattern). Who knows if a 3" Y will even fit.
You're going to have to consider your tuning option as well and probably a 90mm+ MAF...unless you're SD or carbed.
I'm using 205s on a big bore and turn nearly 7000rpm...and you've seen how fast my truck moves. I wouldn't worry too much about RPM. I'd suggest seriously considering Ed's recommendations so you don't wind up with a project of mismatched parts.
Lastly, adding a (new/used) blower and some exhaust to your existing setup may save you some coin (if it will work...engine compression? cam?), but there are trade-offs. It's worth considering and weighing your options....and you'll have to do the math/research. Your engine management solution will also have some input on this decision if this is feasible or not.
That said, I also recommend talking to the lightning guys for your headers...I think some of those guys have used mustang headers and simply notched the frame a bit (but be aware, they lack 4WD also). I've found the Bronco forums to be useless....in nearly every way.
After building my truck, I've learned that building one-off vehicles using combinations with unknown outcomes can get very expensive (very quickly). I've got 3x the amount of cash into my truck than what the engine costs...and It's not even finished. I've spent A LOT of money on stuff I purchased but had to offload at deep discounts because something didn't fit or turned out to be a crappy solution. What's nice about the Mustangs is that there are plenty of cookie cutter solutions that just work and (generally) fit....meanwhile the amount of fabrication and custom crap I had to do to my truck was ridiculous, expensive, and time consuming. I was in a fortunate position as I could afford it (both in money and time), but if I could go back in time, I wouldn't have started the project.
Did you ever take this thing to a dyno to get tuned? How bout running it at a track to see how it performs?