water leak

[bonnieclyde100]

i have a 69 chevy truck and i keep getting a leak at a couple of head bolts on my engine. the bolts on outside of head cover near the back of the heads. when i built the engine i used arp thread sealant .and after a couple hundred miles it started to leak so i pulled all the bolts and resealed all the threads with a different sealant and again after a couple hundred miles the same bolts started to leak again. i am not getting any water in the engine and i am not having overheating and i am only loosing about a quart of water every couple of days. i dont really want to put those sealants in the radiator because they make a mess inside the motor and i am afraid they clog up some of the water jackets in the block and heads but i dont know what else to try. any ideas?