Yeah your best bet is to focus on a cam with spec within this range: 218-221 for the intake lobes, and 228-230 for the exhaust lobes, and a 117 or 118 lsa to help keep the overlap in the -8* to -12* range I'd stick with a fairly mild exhaust lobe for a quieter(stealthy) valve train.
You're most likely looking at a custom cam.

 

A high 220s cam will have a different idle that stock, most gearheads will be easily able to tell you have a cam.

 

Normally Yes, but not always. You might be able to tell by the sound if a engine has a performance cam in it or not, but not size/duration of the cam. You can have 2 cams with exactly the same lobes, lets say a 227/227 but one with a 110lsa and the other with a 118lsa. The 227/227 110 lsa cam will have 7* OL and a very clear cam lope , and the 227/227 118lsa will have -9* overlap and have a almost stock like sound. These two cams will not sound the same at all.

 

based on 119.85 trap speed I'm probably at or near 380 rear

 

Got my 5.3 short block!

 

If you're going with a sleeper setup, why did you go with a 5.3 and not something bigger that will make more power and look just as stock?

 

Got the 5.3 for free! ^

 

I see your a fellow Texan!
I would at least try to paint the short block with some silver or aluminum looking paint while its out.

 

Yeah will do! Gotta clean it up tho! It's a dirty ****** lol