You might want to contact SPF direct as my info is only here-say.
BUT... from my understanding, there were some minor changes to the engine bay, widening it and lifting the recesses in the firewall, where the trans tunnel is, in order to fit the modular engine.
The changes you mentioned: steering links, motor mounts would be the least of your problems.
I'm not certain but I believe these changes were instigated around chassis no:2200, and built in to every kit there after. (someone pls verify).
I'm sure there's an SPF expert here that would know or perhaps try SCOF.
If you are happy fabricating, had the time, money, energy and wanted the challenge, I'm sure it could be managed.
It wouldn't be something I'd personally do, the gain would be far out weighted by the pain.
However, if you're still keen on a modular, then I say go for it.
It's more than enough engine & torque to enjoy in a car weighing in at around 2400# regardless of what people might tell you
...and you could always program a couple of settings on the ECU too, which would allow you to go from street cruising to balls-out racing with the flick of a switch.