My '65 Coronet was down to 3350 with all steel body, fully gutted interior, no carpet, 1 plastic seat, 6 PT bar(VERY HEAVY), gutted doors w/ plastic windows, 125# battery in the trunk, no alt, alum WP housing, all iron 440 w/ tunnel ram.
Edit: Dana 60, Centerline wheels, gutted dash, no heater.