Stock 700r4/4L60 behind mild 350

A 700R4 is capable of handling the power you are talking about. Or while you have it out you could get it built to be even stronger. Don't need to go hog wild, but there are a few things that could use improvement. By 89 the 700R4 was getting pretty tuff. I ran one behind a 454 in a RWD S10.
2 things will kill a 700R4 quickly. Proper adjustment of the TV (throttle valve) cable. It's not just a kick down like back in the day. It controls the transmission's internal pressure and one good WOT pass, with it way out of adjustment, can fry the trans.
The 2nd is the size of your right foot. Beat on it hard enough and long enough will kill any transmission. Most of the complaints about 700R4's are from guys who beat them and have no idea if the TV is adjusted or not.

You can check with @Tranzman to be sure, but I seem to remember at least the 1/2 ton full size and the S10 transmissions using the same internals. They do use a different broadcast code on the full size than they do on the S-series, but I believe that is more about shift points. hard parts are the same, IIRC. Been 20 years since I last played with a 700R4.

Gen210 said:

I prefer the 2004r in this case

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In this case, since the truck is a 4x4, it'd be tough using a 200. Or any other trans w/o a lot of adapting and mods.