https://puredieselpower.com/dodge-products/he351-turbo-12-valve-oil-inlet-feed-fitting.html I think this is the fitting you need for your oil line but it is metric o-ring boss on the turbo side. I was trying to find the adapter plate. Looks like most everyone uses the -4 AN adapter plate and a -4 line when doing that particular style turbo. You could possibly make an adapter plate for the fitting or make a steel adapter plate and just braze or weld the fitting to it.
I was gonna suggest the adapter plate. Is there a significant benefit to using direct threads?

