My neighbor has a 428 in his 69 Cougar and just had it dyno'd this weekend and has 555 RWhorses and 676 RWtorque ... all N/A
The 428 is narrower than the modular 4.6 so fitting shouldn't be an issue.
Something else to think about...He bought his short block for $3000. Heads were a grand, carb was 500 and then about 2500 in other various machining and parts he said. That's about $7500 and it makes 555 RWH and 676 RWT. So our engine is $800 cheaper but makes more than 250 less horse and more than 370 less torque.
Your neighbor also couldn't come close to passing modern emissions, and likely can't provide the reliability and driveability expected out of a mass production vehicle. It would still be awesome to see. What about the Roush 427R?
The black car in 5.0 magazine had a 427 cammer in it. that was a crate engine
ford offered to battle the hemi cars in the 60's Think it was rated a little over 600 hp.
i know where i can pick up a rolled mach1 428/4speed/9inch with 60-something thousand original miles for about $6000. would be sweet to pick up and pull the drivetrain for the S197. problem is, once you do the swap it will cost twice as much as you expected & will probably loose functions from most of the stock instruments and safety features. the amount of fabrication is more than most people realize. bolting the engine in the car is the easy part. making all the small details work is the hard part.