Torsion bars the bigger the better???

Also if you were to use stock big block bars on a small block car, then lighten up the small block by putting it on an aluminum diet, mini starter, aluminum radiator, how much more can you offset that? A stock big block weighs about what 250lbs more than a stock small block. How much more can you realistically shave off the small block with aluminum parts? 75 more lbs maybe? If you use aluminum heads, intake, mini starter, mini alternator, aluminum radiator. This makes those big block torsion bars a bit stiffer.