Just saw that my pre boost fueling screw has never been touched, so with all these mods should I turn that in back it out or just not touch it.

It will do both if you set it one way or the other.

If you are puking black, you aren't getting any extra power. Just wasting fuel

so im thinking turning it down will not do much. The truck is kind of hard to blow a big puff since the turbo, much harder than stock one but does not bother me at all I do not like smoke.

The pre boost is pre boost only so no affect on cruising egt. Having it properly tuned will make the turbo light faster but too little or too much will cause it to smoke. if it has good response from 0 boost Id leave it. I usually back them all te way out them start by setting it a 1/8 of a turn at a time until it start to smoke pre boost and watch your throttle response. And the timing tool if you buy one comes with a whole instructions and charts and what not

Okay I'll probaly advance the timing but we're I looked for the 96-98 12v the stock timing is 14 already.. really think 2 degrees for all thst work would do much.

Don't think like that.

Think of it as a percentage. Right now, you're at 13 (stock is I think 13 or 12.5 on my truck anyway, a 95 auto).

So if you go up to, say, 16, that's 3 more. 3 is nearly 25% of 13.
So you're advancing the fuel timing nearly 25% over stock.

That's a frickload, really. It'll make a big difference.

But only up top I'll feel the power? While it cuts off torque curve.

Think of it this way:
Are you only advancing the timing at the top of the curve?

Up until you get to an undriveable point, it'll help the whole band

At that low of timing all it will do is improve. Once you get over 20 is where it's better for high end power. I personally wouldn't both with 16 degrees. Since you have studs Id go at least 18 ish. Get your times worth out of it.

I was thinking of 17 degrees with .024 dvs or ddps magic ones and still a intercooler.