Firstly, I simply must ask the question, "why?". Is the engine that's
currently in the car worn out or close to it? Is there anything wrong with
the engine as an engine? If not, I see no reason to make a switch . . .
. . and I can see lots of reasons NOT to switch engines, unles you're a
"glutton for punishment". Seriously. I'm not trying to insult you or
question your judgment. I just want to know the real "why".
Secondly, any of the suggested possible engine swaps/changes are going
to prove to be a disappointment, even in the best of luck and circumstances.
This is because these Lincolns are exceptionally heavy. Thus, they require
MASSIVE amounts of torque---torque that you will not get from any other
engine in sufficient quantity, unless you opt for a late 60s - early 70s 460.
Now, the 460 is physically much smaller on the outside. It IS, to be very
sure, eminently strong enough, "torquey enough", for the job.
But, again; I have to ask, why do you want to do this job? Unless the
engine in your car is seriously "tired", I advise against it. While the
Lincoln engineers did, at times, design weird stuff like hydraulic windshield
wipers or four-muffler dual exhaust systems [translated, quiet but
expensive], these engineers DID know what they were doing when it came
to engines. You can be very sure about that.
Finally, what do you think a different engine will achieve for your car?