best factory head and intake

i'm building a factory stock and the rules state. oem non vortec cast iron with no porting or polishing and same for the intake. could any one point me in the right direction as for casting numbers and such. these will be put on a 355.i'm looking to turn about 6k rpm.

i have a set of 601s already would these work?

ttt

http://www.users.interport.net/s/r/srweiss/tablehdc.htm#BBChrysler

That website should help you out and point you in the right direction. It lists flow numbers for various casting numbers.