My car just turned over 180k miles and it runs great, minus using oil in between changes which varies based on brand of oil, ususally 1-2 qts in 5k miles. I believe it to be burning it as the underside of the car is clean and the engine is leak free. The blue cloud of smoke on start up is also a dead give away. I've been reasearching the PI head swap since I figure the oil buring is from worn valve guides and/or bad seals. I figure if they need to come off they might was well be swapped for better ones. My question is from my reasearch it looks like I'll have a minimum of $600 in the swap before having the car tuned. I can get a complete lower mileage (50-80k) crown vic engine for roughly that same price. I realize I will probably have to swap some things around to make the engine fit the mustang (exhaust manifolds, front accessory drive, ignition/electrical components etc). but it almost seems to make more sense to me to swap in a complete lower mileage PI engine than just do the head swap. What do you guys that have done the head swap think? If you had it to do over again what would you do?