Might look into some Jaguar camshafts if you have the top off. No idea how much more lift/duration you can go without access to a programmer. Good time to do timing chains, tensioners and guides while you are in there. You can look at SCT for a programmer although I don't know how extensive their programmer is. You'll want one that will allow you to modify the volumetric efficiency, fuel, and timing at a minimum. Porting the heads might be beneficial for you as well. No idea how much you can do on them though. Head porting is an art, and while it's possible to do it yourself it pays to get someone good at it to do the work for you.
One other thing that I'd thought about for mine, swapping coils for something more reliable. I had thought about using Chevy LS coils in placed of the COPs on the Lincoln. To do this you'd need to investigate the wiring differences (I lost interest in the car before getting to that stage), build brackets, and swap plugs. For plug wires I was going to use a hole saw to cut holes in the factory coil cover for a pass-through, then use spark plug wires with the rubber plug on the wire designed to block off the spark plug hole. This would keep water out of the plug wells. The reason for the Chevy coils is they are quite a bit larger and more robust than the COPs, so should last a lot longer. Using them would depend upon whether the actual wiring inputs can be converted.
Good luck to you, hope you can get what you want out of it.