That looks milky like a leaking head gasket.

Eww I've seen something like that on a VW oil cap before

i hope its not the HG cause i havent even started the engine yet to pressureize it yet. found this after I filled car with coolant it began leaking from the freeze plugs. removed plugs and found this i have a email into the shop that built my engine but have not heard anything back from them yet.

Well if you haven't started it I'm sure it's not HG. I've seen it under oil caps also on alot of new cars. I work at a dealership.

i dont think its a HG either but if this place claimed to clean my block wouldnt all of this crap be removed when it was hot tanked? My build has turned into a nightmare. Any other opinions?

Could be assembly lube but idk that seems like quite a bit to me

I would think that it would be cleaned if it were hot tanked. Also I would be a little scarred if a freeze plug comes out easily.