2014 hemi 5.7 replacing a 318 in a 1977 power wagon 4X4 ?

I think the hardest part of this swap will be exhaust manifolds, engine mounts and oil pan. Hotwire can provide the support you need for electronics and as other's have pointed out using a 727 shouldn't be problem with the right flex plate or spacer.

The factory 5.7L Hemi truck oil pain is a rear rear sump pan, while the factory car pan is a front sump pan, most of the swap oil pans are mid sump pans designed for 67-73 A, B, and E Mopars. You'll need to find the one of the most closely matches your existing 318 oil pan. Hopefully one is close enough to clear steering and the cross member.

Exhaust manifolds, the factory 5.7L Hemi truck manifolds point nearly straight back and typically won't work in A-Bodies. Many swaps have been successful with factory Jeep manifolds. If your stock manifolds dump straight down, you might find that Street and Performance in Mena Arkansas has a set of shorty headers that dumps straight down. They also have a set of block hugging headers that are closer to the car style exhaust manifolds.

http://www.hotrodlane.cc/

Motor mounts. You're 77 318 uses a bisquit type mount that is similar to the 68-72 biscuit mounts used on A, B, and E bodies. TTI makes mounts that work with the biscuit type mounts and will attach to 68-72 V-8 A B and E bodies whether these will work with a truck K member is unclear. Several members on this forum have made their own mounts with a little effort.

Hope this gets you headed in the right direction.

Regards,

Joe Dokes