how many cc chamber = 302 heads

also what rockers would you think of using when building a stroker. My plan is to build a 418 out of my 340. just so many combinations. Its a street strip car. The run down now is
30 over
m-1 single plane with 650 double pumper
292 509 purple shaft
transmisson is 904 with cheetah valve body and low first gear with a ger 3500 stall tied to a 410 suregrip and I run 29x15.50 sportsman pro's

the car presently runs low 12:60's I drive to track about 45 mins from my house.

Any suggestions would be appreciated?
rockers?
cam? it's got a great sound now.
stroker crank I was thinking was a Scat 4.00 with I beam rods, but what piston KB, PE, srp. They would have to be .040

thanks