from what it sounds like, at least a few grand. a carberator (depending on what you get; 2/4 bbl, the CFM, etc.) will go from anywhere from $100 to roughly $450ish. Headlights shouldnt be more then $50, but a paint job (depending on what condition the body is in) may include sanding, priming, and then the paintjob itself. That could be $200-$1000+ (you get what you pay for in paintjobs). The interior you made sound like needs a complete overhaul. That is expensive. You need to find new dash, new seats, carpet, wiring, new center console, new back seats, new trim, new weather stripping, new side panels, new door panels...and thats the major things. theres all the little nooks and crannys of redoing interiors as well. And, usually when you have to redo the interior, you may need to replace the floorpan. Not always the case, but thats something you need to really really watch for if it needs new a new interior. I'm gonna say if its just a refurbrish, and you can reuse alot of the old stuff, then somewhere between $100-$1000. If its a gutting, then I'd say more like $450- $1500. I didnt factor labor into those numbers either. Make sure your up to it too. An entire interior is alot of work. I mean ALOT of work. Final numbers though, on the low end I'd say $450, but on the high end I'd say $3000ish. I hope this helps
