MINICRAFT offer the best 1/144 DC-8 option .... if it can be gotten.
Their current kits have had a good reviews ....
https://modelingmadness.com/review/civil/thomdc8.htmhttps://ipmsusa.org/reviews/Kits/Aircra ... 44_dc8.htmhttps://www.britmodeller.com/forums/ind ... t-dc-8-61/Think MINICRAFT only marketed the SUPER 63 and SUPER 71 though. The interior fuselages of these kits are marked with cutting points .... to enable modification to either a SUPER 62 or -50 versions .... but which requires some "precision fuselage surgery" if undertaken. And then one still needs to acquire the correct after-market engines and pylons too. Think the MINICRAFT kits also come with alternative wing tips .... enabling one to specifically represent the SUPER 61/71 or SUPER 63/73 wing since there "is" a difference between both. Think there's also after-market CFM-56 engine nacelles for the SUPER 73 (specifically) too featuring strakes that the SUPER 71's don't have.
Given MINICRAFT did a good job tooling their SUPER 63 and SUPER 71 kits (as they did also in regard to their B707 SERIES) it's a pity the line was never further extended to enable the 10/20/30/40, -50, and SUPER 62 versions .... with the correct parts customized for each and without requiring fuselage cutting. There "IS" a market for all versions of the DC-8 in 1/144 scale and it would work .... "if marketed properly" .... and which could result is success akin to that of their B707 series.
You should enjoy that kit Marty
The only other 1/144 DC-8 options are the originally REVELL/REVELL GERMANY tooled/marketed options .... for the the -10 and SUPER 61 ....

.... and the SUPER 61 ....

.... but both of the above kits are getting wee a bit long in the tooth now .... if they can still be acquired at all. The old REVELL -10 kit can be modified to a -50 using after-market engine nacelle parts (a relatively simple conversion). Their SUPER 61 kit is "reasonably good" and features correct engines and pylons parts for that version (and which can also be used to convert their -10 to a -50), but, this kit has in the past been incorrectly marketed as a SUPER 63 (unfortunately) as evidenced here ....


Note the engines and pylon features evident in box art for each of each of the above and which are correct "for a DC-8 SUPER 63", but, both kits actually contain "DC-8-50/SUPER 61" engines and pylons parts

Both the SUPER 61 and SUPER 63 are "quite different" in respect of these particular details .... given the SUPER 63 (specifically) requires different engines and pylons .... plus different/extended wing tips too .... most of which is (or was) available as independently marketed after-market products.
Mark C
AKL/NZ