Join Date: Jan 2019
Location: Sedgwick, Kansas
It looks like the Blueprint Engines are being a bit more honest with their horsepower numbers, too.
It's possible that the ATK motor could be pulling down 300 horses, but with stock E7TE heads and a mild cam like that, I'm thinking their numbers are a bit inflated. You'd have to have some mighty good supporting hardware to really hit that.
But all of this is beside the point: My recommendation would be 'neither'. You could rebuild yours for a whole lot less. If you're still nervous about your motor, find a roller cam salvage yard engine with 100k miles or less for about $300. Then you could decide to use GT40P heads (if you chose your engine from a '98-2001 Explorer or Mountaineer), which would need new springs and a better cam. OR, you could get some aftermarket aluminum heads.
No matter how you look at this, doing a bit of work would get your car back on the road stronger than ever for maybe 1-2k, instead of 3-4k.
If there's a problem with the bottom end on the engine you chose (which would be rather surprising, unless it was really abused), most salvage yards will allow you to exchange with little or no fuss. You'd know right after getting the heads off. Most of these engines have a lot of life left in them.
"No matter what you are, be the best one you can." -Abraham Lincoln