You know what makes A-bodies so great?

Actual curb weight is 3607 lbs for a '79 Z28.



'70 Chevelle SS454 curb weight is 3836 lbs.

'70 Dart Swinger 340 is 3170 lbs

'70 Road Runner 383 is 3646 lbs

Clearly the Dart is far lighter, giving it a better power to weight ratio, coincidentally the same as a 1970 Nova SS at 3170 lbs.

All figures were result of google searches.
id say the 70 nova weight is off, same components as the camaro and 8 inches longer! specially a 70 ss, till 71 all ss cars were BB!