I have a set of the big block Speedmaster Victor copies I bought a couples years ago on black Friday. Still sitting in boxes. If you want to see any specific angles in pictures I can try to get that for you today to help you decide. Because I have a set I would love to see how they respond to some porting work.
I am not familiar with the Edelbrock version so I cannot comment on that, but I think I remember someone saying the Speedmaster head is closer to the first version of big block Edelbrock Victor.