Can only get 4⁰ advance need advice.

I had rebuilt the distributor and when i reassembled the bracket i didnt put it in the center. I dont know why but i didnt.

Okeh, but the centre of the slot isn't necessarily where it needs to be. It needs to be wherever it gives you an appropriate range of timing adjustment with the distributor installed.

If you're going to try one tooth (or more) clockwise or anticlockwise, take care; it's easy to get crossed up. Read this