I'd like to park myself after Grover for the springs. I also need retainers & keepers. Delta cams suggested my stock springs would be OK with the .425 lift regrind cam but I could shim them if they float. yesterday, after weeks of breaking in the engine I decided to let her rev and felt the power nose over at about 6k. Now I am generally of a mind that if I float the valves that I throw away the springs so I am looking for something better. Would the GX springs not be appropriate?