I was able to keep the rear seat AND the door armrests. Is it 100% to the letter of the rulebook? Probably not. Will it get me booted from the track. I really doubt it.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.