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

[Heavymetl]

LS for sure.

At this point, in 2015, it shouldn't even be a "debate" if starting from scratch as you are planning in doing.

Better driveability, wide power band, smooth, fuel mileage, throttle response, no leaks, easy cold starts, and if modded at all, WAY more power.

If you're new to the LS world, you'll probably think everyone is full of crap when it comes to power claims. I remember being where you are now and browsing LS1tech forums and seeing all these 346c.i., pump gas, full weight F-Bodies running 120+mph and low 11's/high 10's and thinking it HAD to be a lie, since the old school SBC just couldn't do that without MAJOR work. Well, it wasn't and it isn't. They are literally worth 100 more horsepower mod for mod over the old school.

Stock, an LS based engine is "meh". Let them breathe and throw in a cam...and it comes to life in a hurry.