I have a 63 Polara that I'm installing 3400lb Super Stock springs in. Which rear shocks should I use?
Buy as much shock as you can afford.
That said, we started with the Calvert 9 position single adjustable on our '63 330. They are fine for a car well into the 10's.
We've been 1.36 60 ft. with them.
I bought Viking Crusaders a while back but just haven't gotten the chance to use them much.
As an aside, the modern made in Mexico SS springs do NOT work well for very long. Granted, I ran ours pretty hard in the first year, but they started losing arch and were done by the end of the season! This is in a drag race application. Part #'s 456/457 which is what I believe you have.