suspension set up

hey everyone lookin for a little input on suspension set up. almost finished with my car looking @ little over 500whp plan to street the car on nice days and during the summer but by no means daily drive, also going to be a weekend track car on occasion. any input on spring rates and brand would be great. looking at getting either koni yellows gc springs right now from a guy for 750 with a 10k front and 8k rear…to stiff? to soft?
thanks