Re: Coming from a Mustang, have a few questions
I'm not sure a C/V could ever be built to be a Mustang killer and remain a practical and streetable daily driver (open to definition) without spending a bundle. (A built 5.4 will run around $5-6K alone, and a stock 5.4 will not produce a power increase worth the effort).
I've been around and owned many of these cars since '92 and I haven't seen any normally aspirated I4.6'sI in a street driven daily driver C/V that could even remotely be considered quick. A few, running deep gears, have run high 13's (admittedly, quick for a street car), but they are drag strip queens, not really daily drivers, and not quite a "sleeper" (the mods would be obvious). If that's what you are looking for then obviously it can be done, and would be a lot of fun, but the engine will need a lot of internal mods. "Speed cost money, how fast do you want to go"?
The 15's wont's fit at all. If you can even bolt them on, they will rub the brake calipers. You will need 16's or larger.
All late model C/V's are PI's. The trick flow heads flow better than stock PI's on a 5.4. I have seen them on 4.6 Mustangs, but I don't know how well they work on the 281.
Let me know what you come up with. I'd like to see a 4.6 that runs well without breaking the bank.
I agree with you regarding comfort. C/V's are more comfortable, reliable, good grocery getters, and easy to get in and out of (I'm 65, 6-0 195 lbs, and it's getting a little harder to bend into the Mustangs, but I am looking for an '08-'09 Bullitt anyway)