I have Aldan Eagle adjustable shocks on all 4 corners and I am changing the spring rates because I'm going with a BBC instead of a small block. Now I will end up with an extra set of springs on the shelf. What are your thoughts for spring rates for a 30 Model A roadster? I guess I should say I am running an IFS and a parallel 4 bar on the rear. I am leaning toward 400 lb on the front with a rear of 225 lbs. I just don't want the roadster to ride like a dump truck with an unbearable ride, but I do not want something which is so soft it will not respond right with my roller BBC. Thanks ahead of time for your assistance and direction!