What part of
EXPLORER ENGINE did I not make clear in my previous post? F150's and Expeditions use Windsor engines with tall, long runner truck intakes and accesory brackets. Passenger vehicles and Explorers use Romeo engines with lower profile car intakes. If you're going to replace the entire engine, your smartest options is to do so with an Explorer engine because not only is it the
exact same configuration as the Mustang, but it also has an aluminum block. An option not available on any other 2V. The only thing you're going to need to swap over is your fuel rails and some minor misc parts and you're done. Having it dyno tuned afterwards to recalibrate your ECU will be most beneficial to performance and drivability, but its not mandatory.
Not only will you pick up all of the power advantages that the PI engine has to offer over your current NPI engine, but because the Explorer has an aluminum block, you'll strip a significant amount of weight from the nose of your car which will aid in both acceleration and handling.
No offence to the original poster, but by the sounds of it, attempting to rebuild his current engine sounds over his head. IMO going that route is going to cost him twice as much because not only will he have to pay for the rebuild parts, but more than likely he'll have to pay someone to put it back together for him after he gives up on it?