Could use some help identifying some roller rockers

There seems to be a lot of misinformation about running the Chevy 1.6 on the Magnum heads. I experimented with this once, geometry was horrible. Lost quite a bit of lift. Well aware of loss with lifter angle, also messed around a lot with push rod length. This is why Hughes sells the 1.65, compensation for the loss of lift. They are indeed the New Zealand casting, awesome score!