yeah, the BB speedmaster heads (that are available) are the copies of the Edelbrock Victor heads. You need offset rockers arms for them and they have that big raised pad on the intake side so that a factory type intake will fit. Small heart shaped combustion chambers.
Way way off topic but I’m going to get to check some flow numbers on some ported Edelbrock big block Victor heads in the near future. My buddy has a beautiful 9 second big block Duster with a set on and wants to check flow numbers before ordering a new cam. I told him to give me a couple weeks as I’m set up for small block heads right now.