Great write up Robert, ad a LOT of work. I admire your skills and determination. Makes me sad I didn't continue with my crew project. The amount of time and money my 03 project took was enough strain on the wallet and family so in reality the 84 crew would have been too much. It still took me over 8 months of all my spare time before I got it on the road. I still have details to finish in the spring.
What year Ramcharger tank did you use? On my buddies 93 W350 we put in a pre EFI Ram fuel tank and and then used a separate electric fuel pump hooked to a simple toggle switch to pump fuel into the stock tank. He has to be careful not to over fill the "smaller" stock tank. This leaves him a "reserve" in the rear tank. He has a service body on the truck so adding an extra fuel door was different than a pick up box. Would an EFI tank with the built in fuel pump work with diesel? On my 84 Crew Cab I put in a second fuel door for just this purpose. I did the same thing on my 82 Club Cab. 1983 was the last year of the "bulge" on the inside of the box for the fuel piping. I would like to do this to my 03 also.
On the subject of clutches, on the same 93 W350, we installed a South Bend Clutch CON OFE and use their HD HYD kit from a 97 but switched the reservoir to the 93 style because of the angle of the cowl. It has a G56 from an 08, as does my 03. The 4X4 shifter was a tight fit against the right hand side of the hole. Here you can see how the reservoir mounts to the cowl of the 93, and just below it the SBC cyl. The 97 doesn't mount on an angle. You can't mount it up higher or the hood would bust it off when you closed it.
<a href="http://s447.photobucket.com/albums/qq195/shadrach1984/G56%20Trans%20in%20a%201st%20gen%20Dodge%20CTD/?action=view&current=DSCN0925.jpg" target="_blank">
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On the subject of the differences between the holes in the cowl that is why I was going to use a complete 93 cowl welded to the crew body. The wiper holes don't line up as well IFRC. I still like 1st gens, especially Crew Cabs as there as way too many 3rd gen 4 doors. Shadrach