Found 68 Shelby and need help

[prototype]

68 GT500 PI. No ram air S code in VIN
68 GT500KR CJ ram air R code in VIN
69-70 GT500 CJ ram air. R code in VIN
69-70 GT500 with drag pack option SCJ ram air R code in VIN 3.91-4.30 rear gear only

There was no external decals or VIN designation for the SCJ. They are completely different engines with LeMans connecting rods, external dampening, engine oil coolers, different horn locations/hardware (as the oil coolers were put where one of the horns was located), transmission gear reducers, etc. A helluva engine included in the very affordable drag pack option.

Oddly the lowest engine on the totem pole the 68 PI (police interceptor) is the only one with an aluminum intake.....CJ's and SCJ's got cast iron manifolds

Don't even get me started on the big and little suspension differences on 1969 Shelbys.