Big Block Swap

Speaking of torsion bars... one reason the big-block gets a bad rep for handling is that the factory .89" bars are not nearly big enough. It will "wallow" unless you also add super-stiff shocks, then you'll hate the ride.
PST makes an affordable 1.03" bar (with discount for FABO members!) and it's amazing how much better my big-block A-body feels. Firm but not harsh ride. Don't let the size scare you off.

Add aluminum heads, intake and water pump and your at small block weight again. Why change torsion bars?