OP. These are the pcv holes..make sure your rear is not blocked by rtv, and make sure you put rtv around the front one even though it's blocked off by the ic, you can still get a Vac leak from it. Doesn't fix your coolant issue but possible vac leak, pcv issue...and you should ditch the breather cap imo and do it correctly so it can be tuned better. If you feel heavy sucking on the oil cap while engine running you have a pcv issue that can cause problems with gaskets as stated...hope you get it figured out.
