Five Star Engines my new "Performance" 310HP motor was not even 210HP glendale, Arizona

I apparently didn't provide enough information. I'll do my best to support my claim:

The "310HP Motor I purchased was a TBI 5.7 (computer controlled) 350. It was advertised as pan to Edlebrock 310HP Motor, sold, built, installed and tuned by the seller/builder Five Star Engine Exchange in Glendale AZ.

Five Star delivered my truck after the install and said I was all set. As I see it:  Five Star delivered their product running the way they intended it to. They replaced many other parts during the install, as (I had given them an open bill for all new parts and to fix anything it needed). They said nothing of any other issues that might cause lack of power. So as I see it they delivered what should have been my 310HP motor.

After a careful break in period, it had less power than the tired old 350 it replaced so after confronting Five Star (and nothing being done about it), I confirmed with an independent Dyno company in my area that what I payed (a premium for) and what I received were two different things.  

I also waited a few months after it was broken in to Dyno it. Fluids were changed before they were due and being that there was only one adult driver, (myself) no aggressive driving or abuse ever took place. The engine ran smooth so there didn't appear to be any major internal problems.

So now that I've put your engine specs argument to rest, all we have is the dyno margin for error. So exactly what is the calculation/margin for error and percentage of loss from crank to wheels?

I've been made aware of the variables so give me a break. If you advertise, install and tune a 310HP motor and the customer ends up with one that after 3 Dyno runs puts down 146, 153 and 157HP  to the wheels? You do the math.

I did not get what I payed for, no matter how you look at it.

Oh wow have I ever been on the other end of this one a few times. Engine horse power out put on a dyno is dependent on so many things including: how the engine is tuned including but not limited to carb type size and jetting, intake type instilation matching and type, header and exshaust size make type matching and install, distributor curve, condition, instilation and set. And most important how well all of this is matched to the internal components and porting of the engine. Finally when all this is validated we have three dyno tuning companies in our area, one calibrates their dyno weekly and knows how to compensate for air density the others don't at all. So guess who we listen to when the customer complains that his engine doesn't make spec. With a little more info I could probably make fun of this post, but with this it's just the whineing of a guy that doesn't know.