500+ci Builder

From what I understand I'm well inside what this motor can handle. Good golly we are only talking about 500-550hp. I've not mention what parts will be used only the builders have stated that and I'm satisfied with the quality. Nearly everything they have listed was middle of the road quality popular brand components.

What are the harder points for me are the 600 pound feet at 3200 and the hydraulic cam requirements.
It should be noted that the definition of "complete engine" can vary even shop to shop. Am I correct in thinking you want to go to the dyno test, when it's done, load it up with everything on it, and go drop it in the car - right? So complete means an engine, carb to pan, pulleys to crank hub and running condition to me.
I just put a proposal together for the heck of it. I do not plan to submit anything - this is for my own peace of mind and discussion's sake. Including every nut, bolt, oil and filters, me supplying a block, RB based 505 CID, would be $12,300 give or take sales tax and shipping. That's E street heads, 4.25 stroke crank, hydraulic roller cam, all new tin, new balancer, new ignition/distributor/wires, new carb, fuel pump, water pump, everything soup to nuts, name brand, new except for the block.
Now - if you are talking about a dyno'd engine - minus the ignition, fuel pump, carb, pulleys, etc. you could lose $1300 or so. If you lose the hydraulic cam requirement it would save another $500 and lower the price to around $10,500.
I share IQs concerns about having suppliers that you approve or don't. You are chosing not to name stuff, which I can totally understand but are there some that you would simply say no to? I looked at all name brand stuff - no ebay vendor, lower end stuff. That's because I've been doing this long enough to know that having less expensive parts available may not mean it's cheaper overall given the labor required to make it all actually work - assuming there is a value placed on your labor.