I think you are right that they are normally aspirated. Stuck in low range all the time and operated on pavement, they need that 70 to keep from breaking the axle. Looks like a CJ cowl and hood, the CJ fenders and grille should kinda fit.
Jeep sold a bunch of them as regular trucks in Australia. https://www.bing.com/images/search?q=australian+CJ-10
- only tugs in the USA, AFAIK.
Maine beekeeper's truck: '77 J10 LWB, 258/T15/D20/3.54 bone stock, low options (delete radio), PS, hubcaps.
Browless and proud: '82 J20 360/T18/NP208/3.73, Destination ATs, 7600 GVWR
Copper Polly: '75 CJ-6, 304/T15, PS, BFG KM2s, soft top
GTI without the badges: '95 VW Golf Sport 2000cc 2D
ECO Green: '15 FCA Jeep Cherokee KL Trailhawk