Welcome. I apologize in advance for how cluttered my response may appear, since I'm replying from my phone.
For injectors, using the 72's injectors will be the easiest approach without tuning since the ecu isn't scaled for the 74's injectors.
For the cam covers, you'll use the 74 rear. The front cover is your choice since the difference is only cosmetic.
For accesories, you will use what your Galant already has with one exception. The upper alternator bracket. It must be from the 74.
Cv shafts are the same between auto and manual, but you will want the manual's intermediate shaft (or jack shaft depending on terminology)
If you have any other questions along the way feel free to ask.
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