Analyze My Timeslip

If i had to guess, i would think it is all street equipment. If i take off the full street exhaust, and change my steelies (i notice he's got cragars, not the lightest of wheels) with street tires , to race wheels and slicks, i can take 150+lbs off the car

still isnt gonna weigh 3800. Thats insane.
Heaviest A body i have ever had weighed 3400 with me( i was probably 270 then) was bone stock bench seat 70 340 Duster with working air. Completely factory car, wheels, interior, etc. nothing to lighten it. Just the way it came from the factory

1967 V8 auto GT was 3056 from the factory, even allowing for 200 pound driver, that is still 550 pounds lighter than the OP’s claim
Detailed specs review of 1967 Dodge Dart 2-Door Sedan 273 V-8 TorqueFlite offered since September 1966 for North America U.S.