The engine/trans/P-shaft/and rearend are an easy 1000 , Your exhaust with headers is about 110, suspension/steering/brakes/and K-member, gotta be 500, bumpers and brackets pushing 100, heater/rad/and water 100, Wheels and tires 150 or more,
That leaves 540 for the driver/body/interior/glass/kick-azz stereo/ and the 30pounds of air per tire,lol..
Ok good luck with that 2500 pound target.