leaky heads gaskets, I'm losing it!

The magnum head gaskets have holes for the pushrods to go through. Can't be used on an LA block because the pushrod angle is different. I'm guessing the 521SD must be the ones I need unless someone else has a better suggestion. When I built my last LA/ magnum cross breed I think I used some white head gaskets but that was 10 years ago and I can't be sure what they were.