4.6 3v in a 1997 mustang

How do you intened on using the car?

What are your goals (horse power and street drivability/manners)?

What is your budget?

Are you after a "plug and play swap" or are your wiring/fab skills good. How much work do you want to do yourself?

What are your plans for engine management? Variable cam timing? Intake? Fuel rails? Ignition (COP or coil packs)?
 
How do you intened on using the car?

What are your goals (horse power and street drivability/manners)?

What is your budget?

Are you after a "plug and play swap" or are your wiring/fab skills good. How much work do you want to do yourself?

What are your plans for engine management? Variable cam timing? Intake? Fuel rails? Ignition (COP or coil packs)?

+1. What is wrong with the original engine?