I'm looking for some pics of the caulking areas in the trunk and engine compartment. The unit specific is a 70 Dart. Also a rough dimension on width of caulk would be great.

Engine compartment has two 1/2" +/- blobs in the corners where the cowl meets the fender aprons. No other sealant other than what goes under the fenders and it's common to see it squished out here and there down the fender lip.

Trunk sealant is like 1-1/4 or so wide and maybe 3/16" -1/4" tall from memory. Often looks pretty sloppy.

If you go onto ebay sometimes you can find trunk pics of dusters, darts etc.

My '69 Barracuda had four 1/2"+/- blobs in the engine bay - one in each corner front and back to fill gaps or holes. Plus two more on the cowl pinch weld to fill alignment holes. Plus two more smaller ones on the top side of the pinch weld to fill two small holes.

Top photo shows front corner of engine bay where a blob that covered a hole was removed. Same on both sides.

My memory is a little dim on this, but I think there were one or two smaller holes on the top side of the cowl pinch weld that were covered with small blobs, second photo.

Engine bay caulk was a dark colored caulk, not tar based, applied before paint. Solvents in the caulk bled into the body paint and changed the paint color.

The trunk caulk was white and way more than needed, also applied before paint. The caulk was, as said, at least 1-1/4" wide, maybe more - very sloppy. The white caulk dried hard and terminated on the center of the axle hump. The paint on the trunk caulk didn't change color as much as in the engine bay.

Caulk from the axle hump forward into the cabin was a black, oily, tar based caulk that bled into the paint on top.

The caulk at the inner fender to fender bolt joint was apparently a different type of caulk from the others, non-hardening and grainy.

How about inside the vehicle... when the caulk is removed from main floor pans, do restorers reapply the caulk?

The Body service manual is what you need. Shoot me a pm with your email address and I can send you a copy in pdf. Its a 71 dodge manual but will be the same. I also have a 72 manual but its hard copy.
It shows you every spot they put sealer and says how wide of a bead to put.

Yes, mainly because if you look closely, you will see holes and gaps in the panel joints and at corners. Another reason is rust prevention.

Interior caulk will be hidden, which means just the minimum reasonable amount needed can be applied by a restorer, rather than spewing bulk like the factory did for high speed without careful aiming.

Nice pics. Those are very helpful.

Forgot about the two other spots on the firewall above the master cylinder and the heater motor area. I think there are small holes there that are filled and the caulk is just slighter higher than the surrounding metal.

My 70 dart did not have caulk squished out between the cowl and firewall joint. Also didn't recall seeing any at the front corners next to the radiator support. May have been a little there and I just forgot.

My floors were mint so I left the interior seam sealer intact. The stuff that is there is still flexible enough that you can sink a fingernail into it.