Actually, all caprice's were rear wheel drive.
Caprice/Impala SS production was stopped in 96 so GM could make more money off the Tahoe (idiots, GM that is)
The 305 is a great engine, BTW.
I have 170k on it, no major internal trouble's, except a crappy ignition system (really crappy)...
I think I'm a fuke though.
Otherwise, it runs great, pulls hard off the light, and can still light 'em up when wet.
(mine is a 86 Parisienne with 305

)