Re: 3 bar map sensor
No, 60 pound injectors are rather uncommon.
You've got a really wild combo on your hands, and by wild, I mean very unusual. Did you buy the truck pre-modified?
The first thing I would do is get a chip and injector set that match, whether that means getting a chip tuned for 60 pound injectors, or switching to popular 50# injectors and getting a 50# chip.
Your next order of business would be a turbo upgrade; the stock turbo is adequate for a bone stock motor, yours has a healthy cam and the Vortec heads, making the stock turbo a severe bottleneck. I wouldn't be surprised if your stock turbo is out of efficiency at 10 PSI (in other words, at 15 psi it would be slower than 10 PSI!).
If you are a new owner; you are going to have your hands full with that truck; so take it easy (especially on the gas pedal) and slow, and read up. There's a lot to learn and whether your truck has a stock bottom end or not, it won't tolerate the type of heavy detonation that can happen with a very mismatched, untuned combo. There's a guy who lives around me that's blown at least 3 fully built (forged bottom end) motors, each one in less than a month, because he could not grasp this concept - so be careful.