Suggestions for new design Aluminum Mopar SB clean slate (kind of) cylinder heads

MOPAROFFICIAL said

Dale Davies do you even know what the length of an ls valve is.
4.87/4.92 ...6 bucks stock or 11.99 starting for stainless, 225-400 a set.
Beehives are 240 bucks. Not very cost effective approach so far.
If you want 1.8 you pay out the *** for ferrea + stems or you sink the valves into the chambers and the diggin begins.
I'll give up a hair in stem diameter for a cheap +.100 11/32 stem vs cost .
Speaking for ootb iron magnums available.. they're already sunk and ledged...so it just gets worse/more chamber shaping.

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Going to Johnny Mac's post he lists hard and fast requirements.
1: Stock port locations.
2: Stud mount rockers oiled through the pushrods.
I know valve length and installed heights. I went through this to install the LM7 valves in my 1966 289 heads.
As I mentioned, Magnum valves can be used. Pretty much all the OEM's are using beehive springs these days. My PAC springs were not cheap either. Now when Blue Print Engines orders up valve springs, they will be ordering a few sets more than you or I will ever use giving them a better price point. Now if they are building a bunch of Gen 3 GM engines and the same springs can be used the prices look better.
When designing a new head they can engineer in pretty much any installed height for the springs that work for them. They can specify valve stem lengths and head diameters to fit their needs and on their volumes the costs balance out a bunch.
Maybe Johnny Mac could comment a bit on this, with a vviewpoint from their end and considering input to this point.