hmm not sure.
did u try propane around the intake ports while it was running to see if the idle raised? looks to be like it could be a leak, the black lines could be the leak and the heads could be sucking oil from the valley in the corners. the white seems like a lean condition but its on the exhaust side. what kind of tuning issues where u having? i tuned mine and i had issues untill my rockers were adjusted correctly, then tunning was easier (rockers basically acted like a vacume leak) made idle tuning a PITA! then my lifters took a dump and whiped out my cam
btw uve got water in the valley, be sure to clean that out well. and your bottom end/shortblock is rather stout for ur engine combo.
i would check the sealing surface on the head an intake to make sure they are true too. either they didnt seal bc they wherent tq'd correctly, the surfaces arent flat or you took too much material off the gasket match and theres not enough sealing surface. I ALWAYS use black RTV on the intake gaskets on both sides around the ports and water jackets... never get a vacume leak and portmatched my stealth ram and heads to 1206 and i have wayyy less sealing surface on my HSR.
seen here, i basically ported my HSR to that gasket intake port line thats in your pic... so i have like 1/16-1/8" sealing surface for my intake gasket. but the transition from intake-head is smooth as a babies A$$! https://www.thirdgen.org/forums/alte...cc-ported.html (HSR/patriot 195cc ported to felpro1206)