Machining complexity + extra specialty parts = $$$, I covered canting the intakes in post#115. Easier with keyed pedestal style rockers, but He wants studs & ball fullcrums, that means custom guide plates. That's more of both which bumps the price up. He's also not designing "World beater" heads, if You get the OP, these are hot street or street/strip target OOTB.
We will provide the guide plates with the heads when we get to retailing them. They won't add any cost. If we can make heads....we can make guideplates lol no worries there. We already do for sbc BBC sbf