I was going through rpm-mustangs and I noticed how you could buy an already built engine. That would be nice get it shippend take out the old in with the new. Barely any elbow work. Would be nice 
I didnt see any prices. Prices could be outrageoulsy high?
Anything negative about buying an already assembled engine?

I didnt see any prices. Prices could be outrageoulsy high?
Anything negative about buying an already assembled engine?
...doing it yourself is the best part