I want to go fuel injected....just not sure which motor to go with, and If I use a no computer trans where do I get a wiring harness that will talk with the motor only? I am more and more confused every day as to which year motors are the best? what size...5.7 6.1? Looking for someone to steer me in the right direction.
I got my "engine only" harness and computer from Hotwire Auto - it's pretty common, as the same setup that would work with the engine and a manual transmission.
"Simple" is of course relative, as is "Best." I went with the newest (lowest mileage) motor I could find, and ended up with a 6.4 taken from an SRT Jeep. Lots of folks run the 5.7's, they're pretty common. The 6.1 is also ubiquitous, so... Buy what you like, frankly, and what your budget and timing can allow. For me, I went with the 727 and a gear vendors overdrive, as it was the only thing I was certain would fit without cutting the tunnel in my '66 Charger. Also, I already had the GV overdrive, so... It was also cheaper.
At some point in the next year or so, I'll probably buy a "core" (broken) 4l60e, and pony up for the adapter bellhousing, and just spend a day pulling the current trans and test fitting the 4L60e. I've heard an awful lot of chatter that it fits with very little cutting of the car, and I'd love a transmission with more modern shifting control (adjustable shift points and firmness.)
I think the most "simple" approach is either a 5.7 or 6.1, and a 727 trans. These motors have a lot of gumption, so with, say, a 3.55 or even a closer to 3.00 rear gear, you'll have a very peppy car with at least decent highway mileage and capability. If highway cruising is a real need for you (I built my car for the Hot Rod Power Tour), then add the gear vendors overdrive. Very "simple," but not cheap.