^^This^^
Many years ago I retro-fit a TBI set up on the SBC that was already in my FJ40. It was definitely an upgrade over the carb mainly due to ease of starting and reliability. Few things are better than turning the key and having the engine start *every time*. However, now that I've done an LS swap I would never consider going backwards to TBI. Performance of the LS over the SBC 350 TBI is night and day and they are generally super easy to wrench on. Their ability to self diagnose is a huge advantage and I would argue parts are easier to source. I mean, how many years has it been since a production vehicle came of the line with a SBC and TBI setup? Gen III take out motors can be found everywhere for cheap and aftermarket support for them is truly amazing.
Honestly, I think some people shy away from an LS swap because of a perception they are too complicated. Certainly there are more wires, sensors, etc. vs. carbs and TBI and the initial installation is a bit more involved as a result. But once up and running the LS is incredibly reliable, easy to maintain, powerful and efficient; it out performs TBI in every way. Definitely worth the extra effort up front.
To the OP...sorry this is probably just another rant about LS vs. carb vs. TBI and may not helpful to you. But it's advice I would give to myself if I were asking the same questions you are. Regardless of which flavor of V8 you go with it will certainly transform the driving experience and usefulness of your 60. Good luck, keep us posted!
-Ed