500 hp 360 ??

Assuming the numbers he gives and his work is top of the line it's doable - but I would doubt if he does this for a living that it's doable for that cost figure.

The changes I'd make - The cam will make street driving an issue because of the requisite gearing and convertor. I would say lose the idea of 500hp and look at the idea of 500tq. It takes less head work, less cam, and is more friendly for "multi-use". At 3K lbs it will only take about 400hp at the crank to get deep into the 12s on a street car and you can do it on a more reasonable gear and livable convertor.
If you have to have "500hp" I'd switch to a solid flat tappet cam and that 6bbl intake is a power hog. You will lose at least 40hp running it on a 500hp engine over an RPM Air Gap or matched single plane like the M1.