#8445 casting heads are what you have on your engine now. Those are the correct OE heads for 84-87 Turbo Regals/Rivs + some others like '84 4.1 and probably NA motors too(?). I think '83 also used these, but dont remember for sure. The prior casting was #6293 which had different shaped ports I think (rounded) and all didnt have bridged coolant passages. They also have std instead of metric bolt holes on the ends unlike the later model 8445's. Anyway, to answer your question, yes of course 8445 ported will work
I have a real nice set of 8445's ported/polished w/ 1.77 and 1.50's waiting to go on my 4.1 project.