Looking to get new valve springs and want to know what my options are with stock 5/16 heads. I'm running 5/16-7/16 studs with full roller rockers if that matters. Want to ward off valve float, running at an 1/8 track and want to spin the engine as far as it will keep pulling.

 

Just to add more info it's a street/strip car, manual and I'm not pulling the heads to change springs