1974 Scamp some assembly required

I was working on my engine bay yesterday and my ADD kicked in and I started messing with the pillars and drip rails they need alot of work! What is the best way to repair this? And btw this body filler material is factory I never worked on that part of the car. Its coming out in chunks? I'm gonna strip it all down and refill it. Do you think all metal filler would be best?

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