340 build No POWER need help w tune

Ok so I've already spoken to some of you guys about this problem in the race forum and still have no luck. So thought I would start a new thread over here.

I've just had a new engine built and installed and here are my specs.

Balanced 340 .40 over. ( just over 10:1 compression ) KB hypo
Eddy RPM heads
Eddy air gap intake
Comp mother thumpr cam. .497/.483
Msd digital 6 plus
Msd pro billet dist.
Tti headers
Holley 750 street hp dp
Holley mech fuel pump

727 trans with 2800 stall right now (TCI 3800 SSFighter on order)
8 3/4 w 4.30 gears
315/60/15 mT drag radials.

Now our first problem was timing and carb running way way too rich. Could not get the idle screws to work ( all the way in and die). She acciually revs up when there all the way in. With the poor poor vacum that cam produces so far we switch the power valve to the correct number for the vacum that's being produced (5" at 1000rpm).
Still ran rich.
We then Opened the secondaries to allow for more air and were able to close up the primaries. That helped with the richness and made her idle a lot better. But there is still no change in the idle mix screws.

Now for the timing. Right now I'm running what I've been told from some of you on here. In the distributer using black bushing and light silver and blue springs. And did my inistial timing @ around 26 degrees.

When I take the car out for a test, and from a stand still mash the gas. It is extremely disappointing. Dosent even spin the tires. :(.

What am I doing wrong!
Haha this is my first build with a more radical cam ect. And can't seem to get it right.

Ps have checked every where for vacum leaks.

Is my timing in correct ??