383/700R4 or Explore LS Swap for my 70 SWB

[Nohassle5]

Hey Guys, Having a bit of an internal dilemma. I have to start off by saying, I’m not the wrench, but know enough to be dangerous. When we built this truck to keep the costs reasonable, I left the basic 327 and TH400 in place as it was completely functional and ran fine. We put AC, nice headers and a polished front runner kit to finish it out. While it won’t set your hair on fire, it cruises fine.
Now that the build is done and operational, I’m wanting a little more response out of my right foot. I’m considering a Smeding 383 E series motor producing 420hp and a phoenix 700R4 OD tranny to mate to it. This is going to bring me up to about 8K in costs + Installation and gotchas. Seems like a fairly bullet proof option and reliable. Any reason I should explore an LS Swap option as I’m essentially just writing a check to get this done? There just seems to be so many pitfalls to getting them running and hooked up. Thoughts?