I have had a number of A bodys with both BB and SB in them, 3050 with the BB and roll bar with two poly race seats, light weight rims and tires, no heater, radio or back seat was pretty common on several Dusters and one 1969 Dart GTS 1967 to 1969 Barracuda fastbacks where a little heivier EDIT: BTW, my current 1971 Duster with a fibreglas front bumper and race hood weighs right at 3200 LBs with out me in it, it has the heater, radio, stock 1973 front bucket seats, extra insulation under the carpet and above the head liner .083 chome moly six point roll bar, sub frame connectors, RJ ladder bars with aluminum coil overs, stock gas tank full and two fairly big batterys in the trunk, light weight race rims and tires, 8 3/4 with a 35 spline spool and axles, 400 BB with Eddy heads and a Best Machine aluminum radiators, Hooker A body fenderwell headers with a three inch full length exhaust sytem with Magna flow muffs mounted at the rear bumper and no X or H pipe