welcome! im in he middle of a swap similar to yours. however mine is a 1996. i believe the carb vs efi option is really dependant upon yourself. IMO the efi is better because it gives yo more tuning capabilities and stuff. also just looks way better than an old school carb set up. the 4l60e will work fine and pretty easily. you need the spacer http://www.jegs.com/i/JEGS+Performan...01010/10002/-1 and the longer bolts http://www.jegs.com/i/JEGS-Performan...01011/10002/-1 then you would have to make the holes on the 5.3 flywheel longer with a dremel or something so they line up to the torque converter. i just did this last week and didn't have any issues.
the 5.3 harness should have all the plugs for the older trans. there might be a difference with the 94 trans. not sure if its the same as my 96. the original harness will control everything else but the engine so gauges abs etc.
read over the obs to lsx thread a few times. it took me a few times to understand everything especially if you haven't started yet. best thing to do is get started then gather the info you need on the step that your at. theres so much info out there and different opinions of different way to do the same thing you will overload yourself with info lol. but looks like you got the basics down. you can take a look at my build thread its pretty damn detailed if i do say so myself and pretty well documented on each step. this is my first swap but thanks to the guys on here i been able to do everyhting in my back yard with basic hand tools and a very small budget. also if you check out minime68s blazer build thread he may be able to help you a little better because your wiring and everything will be the same.
good luck with your build and keep us posted


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