Finding an original Johan '68 Olds 442 is nearly impossible. I found one several years ago, only to find a nice original box filled with scrap parts and sprues. Modelhaus has a very nice conversion kit to use with the MPC/AMT '69 Olds 442.
I like the Huracan, looks like another Lamborghini with full engine detail. Hope they continue this in the future. Why does that FXX K in that color scheme look like a General Lee to me? Add a flag and flip the 1 and 0.
Looks great! I have been trying to piece one together for a while. I can't find my original and 2 I bought online had crushed bodies. Btw, if you are looking for another, get the Testors HSO release in the cardboard box, it has a full set of photo-etched emblems included.
Although not a Dodge, but my cousin had a 1970 Chevy c10 pickup that was special ordered Plum Crazy with white interior. There was also an old lady in town that had special ordered a 1970 Olds Cutlass in Plum Crazy with white interior. Very attractive color combination.
If this is a solid color polishing should be fine. Beware that the run may still be soft and wet in the thickest part of the run. Allow extra time to fully cure. I had a similar issue with some 2k clear. Once fully cured I used a razor blade to shave the run level with the surface then polished out. Not sure if this would work in your situation.
I don't think there was a darker green color that was painted, the vinyl had a darker shade green, but I have no idea what would match. Other than finding some original vinyl samples and having it color matched.
Scale Finishes has all the 1955 Chevy colors in airbrush ready bottles. As an example of 5-6-7 Chevy paints from Scale Finishes, here is a '56 Nomad I am working on, done in Laurel Green/Crocus Yellow.