I am bilding a 70 challenger, and puting in the 5.7. i got the motor, tranny (auto), computer, wireing, and all from a rolled ram for $4500. i made the mounts and headers my self. it will be on the road this spring. a friend of mine wants me to put a 5.7 hemi in his prowler after the challenger is finished. the prowler swap should not cost more than $10000. a crossfire swap can be done for the same. im doing this cuz its fun and the cars will be that much more uniqe, its to show and look cool, if you want a ton of power and purfect balance then you bild a race car, not do a motor swap.