Sorry, I Don't have any nice 186,s rite now. All the heads I have would require a lot of work, inserts/studs/ etc. just orphan heads that are hurt. I know you are going to "lean" on it so a nice set is in order.
Jason - SuperNovaSS said he has a nice set of bare "492" angle plug heads, those already have screw in studs & guide Plates. and those would be period correct for your day 2 look, and have the same end casting symbols as a "186".
I even had a set of those on my own Z about 1975, when you could buy them from GM for $80 a head bare. Then just buy valves/springs and assemble them. Great cylinder head BTW.
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