Mabrouk on your new ride. Thats a nice Eid gift.
EID MUBARAK.
Regards to service center for chevy isnt big of deal. In al quoz area there are many good places and cost half than al ghandi. Max Garage, Techninal Garage, Robbies motorsport etc. All are around or behind MOE (Mall of Emirates).
For body kit i suggest see an online shops from ICON AUTO, AEV, SPEED TECHNOLOGIES, RAMY in deira etc.
Know issue for caprice is drive carefully looking speedometer: As its so smooth and silky you hardly notice the increase speed and end up in plenty fines.
Badges, no idea, but i guess if you go to deira naif area to car accessories guys they will redirect you somewhere more appropriate.
Good luck and drive safe, let me know the name and number for foiling guy. I might be interested in few months.