A Body swap with E body 8 3/4 with 4link

Hello guys I'm new to this forum and ok with my Mopar knowledge. Anyways I have a 1967 Dodge Dart original v6 and I wanted to change to GTS gerst 4link with the 8 3/4 E body I just bought. The 8 3/4 rear is complete with 3.23 and 12" drums but idk what id need to do to fit the rearend in My A Body dart. Also what kind of 8 3/4 is it? Looks original rear end with the 12" on them with lines and brake line also but idk. So please if you guys could help me I honestly don't want to shorten the 8 3/4 but if I have to what are the top of the line internal axles to get?

ThNKS a lot everyone and I hope to hear from you guys

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Why would you go to all the work of building a four link setup and then use a 8.75 rear end? If it is a drag car then put a Dana 60 in it. If it is a street car/road race car then use a Ford 9 inch. A four link install is going to require a ton of welding to the housing so the rearend needs to be stripped down anyway. At that point it only takes a little bit of work to cut the tubes to the proper length. Are you going to have a chassis shop install the four link or is this something you're going to tackle as a back yard project? You'll need a ton of tools, time and talent to do a four link conversion so narrowing the rearend will be the least of your worries.