I think you need more information on the cam to make a recommendation. Did you contact the cam manuf and get their recommendation? Is it solid flat tapper, hyd roller, solid roller? Just fyi, i run a 512 bb stroker with a comp solid flat tappet with .648” lift and 262 @ .050” and i run isky 8005a springs. Pulls hard and fine up to 7000 on my setup. Good spring in my book.