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I found a lq9 from a 04 escalade at the pick and pull and got it for 100$. I was gonna put on a set of 243's and truck intake from a gen 4 5.3. With a cam what sort of power would I be getting out of the motor and would this be a good street combo?
Do you want it to drive good, or just make some kind of a "number"?
If it's going in a truck as it sounds like, a "Stage 3" truck cam would be about perfect. There's a few of em out there under different names; they're typically 216/220° duration, you can get em in lifts from .525" or so up to .600". TSP, CamMotion, Vinci, I know all have cams in that range.
Also a pretty heavy vehicle, though not quite like a truck. Same kind of cam will probably work quite well for it. 1 step up from that, the 220/224° sort of range, might also be OK if the car has a converter AND gears. Like, 3000 or higher, and 3.42 or higher. Otherwise the 216 neighborhood is probably where you need to be.
An LQ9 with 243 heads is an Iron LS2. So anything you see for an LS2 should apply, build/power wise, plus car LS2s had a poor intake manifold (TBSS LS2s had the best one, on the other hand).
Depending on your cam, it would typically be 500-525hp at the crank or so for a basic setup. More if you have those heads touched up a little while off.
My lq4 with 241 heads, ls6 intake and a large custom grind cam made about 425hp 395 tq @6500rpm, to the wheels thru a t56 and 12 bolt. 01 Camaro ss full weight went 11.80 @119 with a 1.9 60ft. I would try to find a TBSS intake instead of the truck intake.
Personally I think the truck intake would be fine, although a TBSS one might give you .0768 more horsepucker and 1.3145927565359 more torx.
Don't over-cam it, and you'll be fine. A 226° cam is probably too much. Although, some of the other cams in the Summit line would probably be just fine. Look for ones in that same 216 - 220° kind of range. Pretty sure they have one.
An engine works best when all the parts work TOGETHER toward the same goal. You're not going to revolutionize a stock LQ9 with a zebra dick cam. If you're gonna leave the heads as-is, you can only gain just so much from a cam, and then after that, the results start to go negative. Been tried, doesn't work. Best thing to do is choose a cam that works WITH the other parts of the motor, not AGAINST them.
G-body is about the same weight as 4th gen f-body.
Anything that applies to f-body will bring similar results in G-body.
All depends on OP expectations.
You found a LQ9 for a $100 that in itself is impressive. I dropped $1,100 for mine lol
Look for a camshaft that closes the intake valve early to build a higher dynamic compression. This will help with low end torque in a heaver vehicle. There are a lot of online camshaft calculators making it easy to calculate dynamic compression and overlap between different grinds.
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Junkyard lq9 
