Welcome to the board, great looking blazer.
Couple answers for ya from my part of the world.
Fuel injection simply works, all the time.
Cross over is good but not necessary with a 4" lift but should be used for 6".
A 6" lift with those 35's might make for a better choice being from the sound of it, your leaning towards actually wheeling it.
(contingent on wheel back spacing etc)
4:11's will be a decent gear for all around driving but not so great for going off road with the 35's and the anemic 1st gear ratio of the 205 t-case.
With that combo you end up with a 1st gear/low crawl ratio of 40:1.
Jump in, ask all the question's you want, they'll get answered whether you like it or not.
