Guide plates

I just acquired a nice set of Motorsports aluminum cobrajet heads. They are complete except for studs and guide plates. What guide plates do these heads take? Also do these require standard pistons or the scj/p51 style piston?

Thanks
Alan

The A429 alum. heads use the g. plates as the iron heads.

Stock valve placement and like Lem said same guideplates as the cast iron heads.

Thank you for the info gents.