Ideas? On a drill jig for converting Magnum heads to LA intake

If you only have one set of your own to do, and you don't own a welder, it would be just as easy to mark your heads using a gasket as a template and then borrow drill press time to ensure they are drilled straight.
If you have access to a welder, building a jig like the picture you included would be a cool task.
I have one of the dual pattern intakes and may try using it as a template or even a drill guide.