Scream'n 318 ?

I was hopin youd at least use a set of speedmaster heads. factory iron i guess would be okay, what castings are you thinking to use? solid roller would be totally cool. I have some factory hydraulic roller lifters im gonna take apart, see if i cant figure out how to make them solid like was suggested. now that'd be really cool.
The two heads I have for consideration are a nice set of 587's and a set of Magnums. I'll do my own porting on either set. I really want the rocker shaft assembly, so right now leaning towards the 587's. Either way I'll use the stock size valves, maybe back cut the face.