IIRC, those heads are for a 318-3 industrial engine. If so, they have a water cross-over, not an exhaust cross-over. They would also have sodium exhaust valves too. I think they used 18mm tapered spark plugs too.
U are correct on all info
I will be selling several sets of other LA heads over the next 6 months moving to another state in two years so I have to thin out items I dont need
