I could not help but notice the red arrow you added to the picture is between two bolts, this is almost a sure sign of a distorted timing cover.

In my experience when dealing with aluminum on iron, I have always done gaskets the same way, it was taught to me by an airplane mechanic.

He told me when dealing with to completely different materials with a gasket to glue the gasket to the one that will grow the most and use a flexible sealant on the other.

In this case, I would use yellow weatherstrip adhesive affectionately called Gorilla Snot, on the aluminum and RTV on the iron side. These two metals move at different rates and are leak prone when overtightened.

That being said, make sure the bolt holes are a bit larger than the fastener, if they contact each other, a leak is eminent.

Oil leaks suck..... Sweet motor though..