Rear shock advice needed.

[Catman]

Thinking of going from rear Afco 2-way adjustable big guns, to Santhuff's.
9.20, 3050 lb. small block, ladder bar, stick shift bracket car.
Looking for a little more consistent 60 ft. times.
In your opinion is it worth the $1800 investment or would it be better to spend the money elsewhere. Much Thanks, Danny