The stock springs won't be able to control the valve at those rpm's aka valve float. Read this on shimming the springs.
http://www.supercarsunlimited.com/in...gs/springs.htm
If I was you I would run these springs.
http://www.compperformancegroupstore...e=SBCNEWValves
What rocker arms are you going to use?
I'm running the same heads on my El Camino, but with a smaller cam so I've been down this road before.