Overheating 360 new engine

I'm running the same setup, Holley Sniper, 3 core radiator, 180 thermostat, March pulley system, and my 360 is bored 30 over. Was reaching 220° now goes to about 205/6 when fan comes on high speed and will typically cool it down but it jumps back up in traffic. The Holley system is controlling the timing. I have it at 36° initially and to 46° on advance. Was running good with plenty of power but still getting a bit hot.
Went to take it out the other day and for some reason now it is running horribly at idle, rough/wants to die. Checked for fuel feeding both primaries(it has)..watching this post!!