Intake manifolds

Ok, now to the problem.

I installed 318 heads on my ´65 273 Barracuda. I got a Edelbrock dualplane with a Holley 600 dp carb.

The engine goes perfect with igniton 7 degrees before TDC, but i will not start.

Chaning igniton to zero degrees TDC it starts but it runs very poor.

What is the problem. Many motor-heads have been looking, but none could come up with some answers

:(

Regards Anders