can you swap out an 1989 mercury grand marquis 302 with auto trans for an mustang 4.6L with a manual trans in that1989 mercury
I'm not going to say it won't work cause if your determined and have enough money eventually you will get it too work but it won't be easy, custom mounts, complete electronic rework, adapting pedal tree to fit, it's a monumental task.
The Mercurys of that vintage never came with a manual transmission so lots of planning and fabrication would need to be done. Can it be done? Sure, but the engine electronics would have to be all figured out. You likely would need a custom driveshaft and new exhaust. It is not worth it.
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