What is the inherent problem with this engine- just head gaskets (not that a head gasket gasket problem isn't enough) or are there other issues with this engine?

If the problem is head gaskets- what's the cause? Perhaps a custom head gasket or head bolts could cure the problem- just a thought.

The thought of retro-fitting another engine just makes me cringe. I've done that & it's off the chart with time & all the little things you don't think about that really add up.