pleased to report success with engine swap. My finished 2012 Range Rover Sport Supercharged in foreground with 2013 engine installed and running well, donor 2013 in the background under car cover, about to be further stripped for any saleable parts being sent off for scrap. Not sure I would do this again, it was a ton of time and work, kind of on the ragged edge of what I could achieve in my small garage with low 8 foot ceilings and no lift. I spent a lot of time just getting the vehicle up off the ground and on heavy duty 12 ton frame/axle stands to ensure I didn't get squashed and killed working underneath it. End result so far does seem like a good result, we'll see. So far the engine swap is running really well, not even throwing any codes, although my remote start and vehicle tracking system seems to have gotten lost or disabled in the engine swap, will have to figure that out.....
on the 79 Lincoln, I phoned the Calgary based company that relined the 1957 Gilera drum brake shoes for me last year, they are a big concern with lots of remanufacturing resources, turns out they also rebuild Hydrobost brake boosters among many other heavy vehicle things, I am dropping off the leaky brake booster from the Lincoln tomorrow for rebuild. They said they would turn it around in about a week.
https://www.fleet-products.ca/
"while i am at it....." I also ordered a brand-new power steering pump from
https://www.thewrenchmonkey.ca/auto-parts/lincoln/mark-v/1979/power-steering-pump/ very reasonably priced, ordered earlier today, already received shipping confirmation, should be here early next week. I figured if the brake booster which runs off the power steerign pump is leaking, the power steering pump can't be too far from failure as well.
Lots of different "internet opinions" as to what power steerign fluid to use for the Hydroboost in a 1979 Lincoln, supposedly in 1977 Ford/Lincoln changed to a GM Saginaw system, amazing what people will obsess over and argue about on hte internet forums, I don't have a clue I only recently discovered what a "Hydroboost" system is........

I am ready for a break from dealing with wrenching on big heavy automobiles, going back to motorcycle winter project shopping soon.....

thanks for all the educated and well-informed replies, amazes me what folks on this forum know about such a broad range of things