422 dyno fail

Bottom line there's a million things that can go wrong. Trying to diagnose every minute detail over the internet is an exercise in futility.

Some educated guesses based on available info (or info needed) to point the Original Poster in the right general direction are helpful to him. Seems the general consensus is this motor is down at least 30-50 hp.

Please read all the posts by Jim Ward within these 11 pages here that provide hard data on his motor.