6.4 Valve springs on a 5.7?

the 6.4 springs are taller than the early by way to much. the early had issues because the valves are physically lower than the newer castings. the early had issues with dropping valves due to design material issues but i can be for sure what it was.
anyway, 6.4 apring find for later heads but not enough spring clearence for the early 5.7s to get a desent cam lift in there an/or the valve setup to last long.
get some eagles, or new big gas heads fro 1500 new a set. will still work on the 5.7 bore fyi.