the Centurion is a GM B-Body or large car.
as such, you'll be able to steal a lot of suspension and frame components from other GM B-, C- or E-body cars.
you'll be looking for the 1971-76 model years
Electra
Le Sabre
Riviera
if you want a different rear end ratio, there is an 8.5" ring gear rear end ( standard GM gear sets ) that you can pull out of 350ci powered Le Sabres that will fit your car. and you could steal the TH-350 while you were at it. these mods would also greatly reduce your rotating mass over what your existing rear and TH-400 are twirling around.
other useful models would include
Olds 88
Olds 98
Pontiac Bonneville
Pontiac Safari
Cadillac De Ville
Chevy Impala
Chevy Caprice
The way to crush the bourgeoisie is to grind them between the millstones of taxation and inflation.
Vladimir Lenin
Government schooling is about "the perfect organization of the hive."
H.H. Goddard, Human Efficiency (1920)
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