Dynacorn is supposed to be the highest quality, but I have used other parts in my restoration with decent results. There are some differences in the fit of the inner cowl panels, which it looks like you'll need to replace. I had similar damage to my cab. Definitely brace the door opening after verifying the door fit. You can remove the doors after taking measurements, or the safest thing is to have the doors in alignment and brace across the interior of the door openings before removing them. I also braced between the lower door hinges across the cab using dimensions from the Factory Assembly Manual.

You can browse thru my photos (link in my signature) for some ideas. I'm sure others will chime in as well.


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.