1990 535 / m30 / Automatic

OK Drove to work just fine. On way home lost all power and heard knocking, 5 blocks from drive way, I nurse it in. Pop Rock Cover and find out 1 and 4 Rocker arms are broken on the intake side.

I was informed that the upper end was rebuilt 30k ago. I do not belive this now as the cam shows much more ware than 30k. Car has 230K on it. Have a receipt for a new head gasket in 02. But no docs on new parts besides gasket. So I now want to fix it right. Please help in guidance.

What would cause break? Or is it just age?

What is the best fix? Pull head and rebuild?

Is there a place that I can order a new head/rebuilt rdy to go head?

I am in Seattle WA. Is there a good BMW Head guy around in the NW?

Can you guys help point me in the right direction on next steps?

Thank you in advance.